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  • Question 1 - The primary auditory cortex is: ...

    Correct

    • The primary auditory cortex is:

      Your Answer: Brodmann area 41

      Explanation:

      A Brodmann area in the brain is defined by cytoarchitecture, histology and organization of cells:Primary Sensory 3,1,2Primary Motor 4Premotor 6Primary Visual 17Primary Auditory 41Brocas 44

    • This question is part of the following fields:

      • Medicine
      • Neurology
      16.5
      Seconds
  • Question 2 - The primary visual cortex is located in the: ...

    Correct

    • The primary visual cortex is located in the:

      Your Answer: Occipital lobe

      Explanation:

      The primary visual cortex is located in the occipital lobe.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      7.6
      Seconds
  • Question 3 - The inverse stretch reflex causing muscle relaxation when excessive force is applied to...

    Incorrect

    • The inverse stretch reflex causing muscle relaxation when excessive force is applied to a muscle is mediated by which sensory organ?

      Your Answer: Muscle spindle

      Correct Answer: Golgi tendon organ

      Explanation:

      Both the muscle spindle and Golgi tendon body are proprioceptors. The Golgi tendon reflex is a normal component of the reflex arc of the peripheral nervous system. In a Golgi tendon reflex, skeletal muscle contraction causes the antagonist muscle to simultaneously lengthen and relax. This reflex is also called the inverse myotatic reflex, because it is the inverse of the stretch reflex.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      19.7
      Seconds
  • Question 4 - Interruption of the left optic tract will result in which visual field defect?...

    Correct

    • Interruption of the left optic tract will result in which visual field defect?

      Your Answer: Right homonymous hemianopia

      Explanation:

      Right homonymous hemianopia is due to a lesion or pressure on the left optic tract. Total blindness of the left eye is due to a complete occlusion of the left optic nerve. Bipolar hemianopia is due to a midline chiasmal lesion. Left nasal hemianopia due to a lesion involving the left perichiasmal area. Right homonymous inferior quadrantanopia is due to involvement of the lower left optic radiations.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      98.2
      Seconds
  • Question 5 - Regarding CSF: ...

    Incorrect

    • Regarding CSF:

      Your Answer: Its volume is about 150ml – 500ml

      Correct Answer: Disruption of arachnoid villi function results in a communicating hydrocephalus

      Explanation:

      In normal adults CSF volume is around 125ml to 150ml. Turnover of the entire volume of cerebrospinal fluid is about 3 to 4 times a day. Composition of CSF is similar to that of plasma except that CSF is nearly protein-free compared with plasma and has different electrolyte levels. Blockage of the foramina causes an obstructive or non-communicating hydrocephalus. Communicating hydrocephalus or non-obstructive hydrocephalus is caused by impaired CSF reabsorption in the absence of any CSF flow obstruction.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      10.5
      Seconds
  • Question 6 - Which serotonergic receptor is associated with vomiting? ...

    Incorrect

    • Which serotonergic receptor is associated with vomiting?

      Your Answer: 5ht2a

      Correct Answer: 5ht3

      Explanation:

      5ht3 is a receptor strongly associated with vomiting, present in vagal afferents, the solitary tract nucleus (STN), and the area posterior. For this reason, 5ht3 antagonists are commonly used as antiemetic drugs. They include ondansetron, tropisetron, and granisetron.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      8.5
      Seconds
  • Question 7 - The axons of which neurons serve as the only output from the cerebellar...

    Correct

    • The axons of which neurons serve as the only output from the cerebellar cortex?

      Your Answer: Purkinje

      Explanation:

      The cerebellar cortex consist of 3 layers. The molecular layer, the granule cell layer and the Purkinje cell layer in the middle. The Purkinje cells project into the deep cerebellar nuclei. They are the only output cells of the cerebellar cortex.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      25.2
      Seconds
  • Question 8 - In the olfactory pathway: Mitral cells project to five regions of the olfactory...

    Incorrect

    • In the olfactory pathway: Mitral cells project to five regions of the olfactory cortex. Which one of the following is not one of the five regions?

      Your Answer: Olfactory tubercle

      Correct Answer: Posterior olfactory nucleus

      Explanation:

      The olfactory system contains peripheral and central divisions which are connected by transduction structures. Peripheral division consists mainly of the nostrils, ethmoid bone, nasal cavity, and the olfactory epithelium. Olfactory neurons are receptor cells in the epithelium that detect odour molecules dissolved in the mucus and transmit information about the odour to the brain in a process called sensory transduction. Olfactory nerves and fibers transmit information about odours from the peripheral olfactory system to the central olfactory system of the brain. The main olfactory bulb transmits pulses to both mitral and tufted cells, which help determine odour concentration. These cells also note differences between highly similar odours and use that data to aid in later recognition. The cells are different with the mitral having low firing-rates and being easily inhibited by neighbouring cells, while tufted have high rates of firing and are more difficult to inhibit. The uncus houses the olfactory cortex which includes the piriform cortex, amygdala, olfactory tubercle, and para-hippocampal gyrus. Entorhinal cortex is an area of middle temporal lobe that has connection with the para-hippocampal gyrus.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      15.3
      Seconds
  • Question 9 - Concerning the sleep-wake cycle, Melatonin is secreted by which structure in the brain...

    Incorrect

    • Concerning the sleep-wake cycle, Melatonin is secreted by which structure in the brain following which environmental conditions?

      Your Answer: Pineal gland, light

      Correct Answer: Pineal gland, darkness

      Explanation:

      Melatonin is secreted by the pineal gland located in the midline attached to the posterior roof of the third ventricle in the brain. Melatonin affects circadian rhythm in the body or the sleep wake cycle. The precursor to melatonin is serotonin and the rate limiting enzyme that converts serotonin to melatonin is low during the day time and reaches its peak during the night.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      18.8
      Seconds
  • Question 10 - The thalamus is a large collection of neuronal groups within the diencephalons which...

    Incorrect

    • The thalamus is a large collection of neuronal groups within the diencephalons which participates in:

      Your Answer: Limbic functions only

      Correct Answer: Sensory, motor and limbic

      Explanation:

      The thalamus has multiple functions. It is the relay station for every sensory system (except olfactory, regulates the sleep-wake cycle and consciousness and also relays motor information.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      14
      Seconds
  • Question 11 - Where are the cell bodies of preganglionic neurons located? ...

    Incorrect

    • Where are the cell bodies of preganglionic neurons located?

      Your Answer: Dorsal root

      Correct Answer: Lateral column

      Explanation:

      The cell bodies of the preganglionic neurons are located in the lateral grey column of the spinal cord and in the motor nuclei of the 3rd, 7th, 9th and 10th cranial nerves.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      8
      Seconds
  • Question 12 - Where is the M1 receptor mainly found? ...

    Incorrect

    • Where is the M1 receptor mainly found?

      Your Answer: Smooth muscle

      Correct Answer: Sympathetic postganglionic neurons

      Explanation:

      M1 receptors are found in the sympathetic postganglionic neurons.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      13.9
      Seconds
  • Question 13 - Which neuron secretes glutamate as its neurotransmitter? ...

    Incorrect

    • Which neuron secretes glutamate as its neurotransmitter?

      Your Answer: Stellate

      Correct Answer: A delta and C pain fibers

      Explanation:

      A delta and C fibers use glutamate as their primary neurotransmitter where it acts as a fast acting localized neurotransmitter.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      74.2
      Seconds
  • Question 14 - Select the correct pairing regarding the surface of the cerebral hemispheres. ...

    Incorrect

    • Select the correct pairing regarding the surface of the cerebral hemispheres.

      Your Answer: None of the above

      Correct Answer: Parietal lobe : primary somatosensory cortex

      Explanation:

      Parietal lobe: The primary somatosensory cortex is located in the postcentral gyrus of the parietal lobe. It is responsible for processing sensory information from the body.

      Frontal lobe: The primary motor cortex is located in the precentral gyrus of the frontal lobe. The frontal lobe also contains the premotor cortex, which is involved in planning movements. The primary visual cortex is located in the occipital lobe, not the frontal lobe.

      Temporal lobe: The primary auditory cortex is located in the superior temporal gyrus of the temporal lobe. The primary motor and premotor cortices are located in the frontal lobe, not the temporal lobe.

      Occipital lobe: The primary visual cortex is located in the occipital lobe. The primary auditory cortex is located in the temporal lobe, not the occipital lobe.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      21.9
      Seconds
  • Question 15 - Visceral afferent fibers are found in the following areas except the…? ...

    Incorrect

    • Visceral afferent fibers are found in the following areas except the…?

      Your Answer: Vagus nerve

      Correct Answer: Trigeminal nerve

      Explanation:

      The general visceral afferent (GVA) fibers carry impulses from viscera to the central nervous system. The cranial nerves that contain GVA fibers include the facial nerve, the glossopharyngeal nerve and the vagus nerve

    • This question is part of the following fields:

      • Medicine
      • Neurology
      10.6
      Seconds
  • Question 16 - Wernicke’s area: ...

    Correct

    • Wernicke’s area:

      Your Answer: Is concerned with comprehension of auditory and visual information

      Explanation:

      Wernicke’s area is located in the categorical hemisphere or left hemisphere in about 95% of right handed individuals and 60% of left handed individuals. It is involved in the comprehension or understanding of written and spoken language. In contrast Broca’s area is involved in production of language.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      11.9
      Seconds
  • Question 17 - The superior orbital fissure is the site of entry/exit for which of the...

    Incorrect

    • The superior orbital fissure is the site of entry/exit for which of the following group of nerves?

      Your Answer: CN II, III, V1, VI

      Correct Answer: CN III, IV, V1, VI

      Explanation:

      The superior and inferior divisions of oculomotor nerve (III), trochlear nerve (IV), lacrimal, frontal and nasociliary branches of ophthalmic V1 and the abducens nerve (VI)

    • This question is part of the following fields:

      • Medicine
      • Neurology
      24.3
      Seconds
  • Question 18 - The brainstem contains which of the following structures? ...

    Incorrect

    • The brainstem contains which of the following structures?

      Your Answer: The hypothalamus, midbrain and pons

      Correct Answer: The midbrain, pons and medulla

      Explanation:

      Brain stem is the base of the brain that connects the brain to the spinal cord. It consists of the mid brain, pons and medulla oblongata.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      13.1
      Seconds
  • Question 19 - Where do the spinothalamic axons decussate? ...

    Incorrect

    • Where do the spinothalamic axons decussate?

      Your Answer: Medulla

      Correct Answer: Spinal cord

      Explanation:

      The second order neurons from the spinothalamic tract cross obliquely to the opposite side in the anterior grey and white commissure within one segment of the spinal cord.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      10.9
      Seconds
  • Question 20 - Regarding the innervation of cerebral blood vessels, which of the following triggers a...

    Incorrect

    • Regarding the innervation of cerebral blood vessels, which of the following triggers a vasoconstrictor effect?

      Your Answer: PHM 27

      Correct Answer: Neuropeptide-Y

      Explanation:

      Substance P is a potent vasodilator, VIP or vasoactive intestinal peptide has vasodilator properties in the intestines. PHM 27 is a potent calcitonin receptor agonist; endogenous analogue of human VIP. CGRP or Calcitonin Gene-Related Peptide is a vasodilator which is found to play an important role in migraines. Neuropeptide Y is a strong vasoconstrictor.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      8.8
      Seconds
  • Question 21 - The majority of corticospinal tract fibers decussate in the: ...

    Incorrect

    • The majority of corticospinal tract fibers decussate in the:

      Your Answer: Forebrain

      Correct Answer: Medulla

      Explanation:

      The corticospinal tract is a descending motor path way that begins in the cerebral cortex and decussates in the pyramids of the medulla.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      12
      Seconds
  • Question 22 - Increase Gamma motor neuron activity produces what effect on the muscle spindle sensitivity?...

    Incorrect

    • Increase Gamma motor neuron activity produces what effect on the muscle spindle sensitivity?

      Your Answer: Minimal decrease

      Correct Answer: Increase

      Explanation:

      The muscle spindle is supplied by both sensory and motor nerves. Sensory supply is Type Ia fibers whereas motor supply is via gamma motor neurons. These neurons also play a role in adjusting the sensitivity of muscle spindles. Increased neuron activity increases the muscle spindle sensitivity.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      10.1
      Seconds
  • Question 23 - Which one of the following neurotransmitters is considered a monoamine? ...

    Correct

    • Which one of the following neurotransmitters is considered a monoamine?

      Your Answer: Dopamine

      Explanation:

      Monoamines are a class of neurotransmitters that include:

      1. Dopamine: A neurotransmitter involved in reward, motivation, and motor control.
      2. Norepinephrine: A neurotransmitter involved in arousal, attention, and stress responses.
      3. Serotonin: Although not listed in the options, it is another key monoamine involved in mood regulation.

      The other neurotransmitters listed are not monoamines:

      • Acetylcholine: This is a different type of neurotransmitter involved in muscle activation and various brain functions.
      • GABA (gamma-aminobutyric acid): This is the main inhibitory neurotransmitter in the central nervous system.
      • Glutamate: This is the main excitatory neurotransmitter in the central nervous system.
      • Glycine: An inhibitory neurotransmitter in the central nervous system.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      34.7
      Seconds
  • Question 24 - Functions of the glossopharyngeal nerve include the following except: ...

    Incorrect

    • Functions of the glossopharyngeal nerve include the following except:

      Your Answer: Transmission of afferent impulses from the carotid baro- and chemoreceptors to the nucleus tractus solitarius in the medulla

      Correct Answer: Proprioceptive input from muscles of the tongue and larynx

      Explanation:

      The glossopharyngeal nerve is a mixed nerve consisting of both sensory and motor fibers. It has several branches and five distinct general functions:Branchial motor- Special visceral efferent- supplies the Stylopharyngeus muscle and superior constrictor muscle.Visceral motor- general visceral efferent- provides parasympathetic innervation of the parotid gland.Visceral sensory- general visceral afferent- carries visceral sensory information from the carotid sinus and carotid body.General sensory- general somatic afferent- provides general sensory information from the inner surface of the tympanic membrane, upper pharynx and posterior one third of the tongue.Visceral afferent- special visceral afferent- provides taste sensation from the posterior one third of the tongue including the circumvallate papillae.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      7.5
      Seconds
  • Question 25 - Which of the following runs in the upper part of the falx cerebri?...

    Incorrect

    • Which of the following runs in the upper part of the falx cerebri?

      Your Answer: Tentorium cerebella

      Correct Answer: Superior sagittal sinus

      Explanation:

      Falx cerebri is a sickle cell fold of dura between the two hemispheres. Its posterior part blends with the superior part of the tentorium cerebelli. The superior sagittal sinus runs in its upper fixed margin, the inferior sagittal sinus in the free concave margin and the straight sinus along its attachment to the tentorium cerebelli.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      13.3
      Seconds
  • Question 26 - Corticospinal tracts are located in the ___ of the white matter. ...

    Incorrect

    • Corticospinal tracts are located in the ___ of the white matter.

      Your Answer: Anterior and posterior funiculi

      Correct Answer: Anterior and lateral funiculi

      Explanation:

      The corticospinal tract is a descending or a motor tract which projects nerve fibers from the cortex of the cerebrum down to different levels of the spinal cord. The descending corticospinal tract descends from the origin, through the corona radiata, posterior half of the lateral ventricle, and enters the midbrain through the cerebral peduncle. In the medulla they form the medullary pyramids on either side of midline as lateral and anterior fibers.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      7.1
      Seconds
  • Question 27 - Which of the following do not pass through the cavernous sinus? ...

    Correct

    • Which of the following do not pass through the cavernous sinus?

      Your Answer: CN 2

      Explanation:

      Oculomotor nerve (N3), trochlear nerve (N4), ophthalmic and mandibular divisions of the trigeminal nerve (N5) pass along its lateral border. The abducent nerve (N6) passes through it along with the internal carotid artery.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      3.7
      Seconds
  • Question 28 - During which stage of sleep is muscle tone in the limbs most reduced?...

    Incorrect

    • During which stage of sleep is muscle tone in the limbs most reduced?

      Your Answer: Stage 1

      Correct Answer: REM

      Explanation:

      Rapid eye movement (REM) stage is marked by extensive physiological changes in the body, such as accelerated respiration, increased brain activity and muscle relaxation. People dream during REM sleep, perhaps as a result of excited brain activity and the paralysis of major voluntary muscles.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      3.2
      Seconds
  • Question 29 - Endolymph in the inner ear is rich in: ...

    Incorrect

    • Endolymph in the inner ear is rich in:

      Your Answer: Na

      Correct Answer: K

      Explanation:

      Cochlear fluids namely endolymph and perilymph have different compositions. Perilymph is a typical extracellular fluid, with ionic composition comparable to plasma or cerebrospinal fluid. The main cation is sodium. Endolymph is a totally unique extracellular fluid, with an ion composition unlike that which is found anywhere else in the body. The major cation in the endolymph is potassium and there is virtually no sodium.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      20.7
      Seconds
  • Question 30 - Which neurotransmitter is found in the postganglionic parasympathetic synaptic cleft? ...

    Incorrect

    • Which neurotransmitter is found in the postganglionic parasympathetic synaptic cleft?

      Your Answer: Noradrenalin

      Correct Answer: Acetylcholine

      Explanation:

      Acetylcholine is the neurotransmitter released from the postganglionic parasympathetic neuron into the synaptic cleft and also by some postganglionic sympathetic neurons as well.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      20.5
      Seconds
  • Question 31 - Which of the following tracts are involved in the control of vital functions?...

    Incorrect

    • Which of the following tracts are involved in the control of vital functions?

      Your Answer: Rubrospinal

      Correct Answer: Reticulospinal

      Explanation:

      Reticulospinal tract pass down from the reticular formation of the mid brain, pons and medulla. It descends in the lateral white column. Both sets of fibers enter the anterior grey column and may facilitate or inhibit the gamma and alpha neurons. By this means the reticulospinal tract controls voluntary and reflex activities. It also contains the descending autonomic fiber, thus providing a pathway for the hypothalamus to control the sympathetic and parasympathetic pathways.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      4.3
      Seconds
  • Question 32 - Which ventral (motor) root is responsible for triceps? ...

    Incorrect

    • Which ventral (motor) root is responsible for triceps?

      Your Answer: C8

      Correct Answer: C7

      Explanation:

      Of the nerve fibers that make up the brachial plexus, C7 mainly forms the radial nerve to innervate the triceps muscle, thus innervating the shoulders, elbow, wrist and hand. C7 is responsible for the triceps reflex.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      8.2
      Seconds
  • Question 33 - Where do the meningeal veins lie? ...

    Incorrect

    • Where do the meningeal veins lie?

      Your Answer: Cerebellum

      Correct Answer: Endosteal layer of the dura

      Explanation:

      Meningeal veins lie in the endosteal layer of the dura. The veins lie lateral to the arteries.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      9.3
      Seconds
  • Question 34 - In which cell would you find a Nissl body? ...

    Incorrect

    • In which cell would you find a Nissl body?

      Your Answer: Oligodendrocyte

      Correct Answer: Bipolar neuron

      Explanation:

      Nissl bodies are the structures of protein synthesis in neurones. They are granular bodies of Rough Endoplasmic Reticulum and ribosomes. Astrocytes, Microglia, Schwann cell, oligodendrocytes are collectively known as glia or supporting cells of the nervous system.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      6.1
      Seconds
  • Question 35 - Which one of the following cells originates from a monocyte and resembles a...

    Incorrect

    • Which one of the following cells originates from a monocyte and resembles a macrophage?

      Your Answer: Neuron

      Correct Answer: Microglia

      Explanation:

      Microglia act as the macrophages of the central nervous system, and they contribute to innate and adaptive immune responses. Studies have shown that microglial cells recognize monocyte antigens, and there are similarities between them that demonstrate that they originate from these monocytes.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      8.9
      Seconds
  • Question 36 - Sequence of events in formation of speech are: ...

    Incorrect

    • Sequence of events in formation of speech are:

      Your Answer: Broca’s area---motor cortex---insula---arcuate fasciculus---Wernicke's area---speech

      Correct Answer: Wernicke’s area---arcuate fasciculus---broca’s area---insula---motor cortex---speech

      Explanation:

      Wernicke’s area is located in the categorical hemisphere or left hemisphere in about 95% of right handed individuals and 60% of left handed individuals. It is involved in the comprehension or understanding of written and spoken language. In contrast Broca’s area is involved in production of language. Firstly, the language is accessed in the Wernicke’s area and these words are sent via the arcuate fasciculus to the Broca’s area, where instructions for articulation is generated. This is then sent from Broca’s are to the motor cortex for the articulation.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      6.2
      Seconds
  • Question 37 - Which cranial nerve is responsible for the parasympathetic nerve supply of the thorax...

    Incorrect

    • Which cranial nerve is responsible for the parasympathetic nerve supply of the thorax and upper abdomen?

      Your Answer: CN Vll

      Correct Answer: CN X

      Explanation:

      Cranial nerve X supplies the structures of the thorax and abdomen. All the rest of the cranial nerves supply the structures in the head and neck

    • This question is part of the following fields:

      • Medicine
      • Neurology
      7.2
      Seconds
  • Question 38 - What is the most abundant cell type in the central nervous system called?...

    Correct

    • What is the most abundant cell type in the central nervous system called?

      Your Answer: Astrocyte

      Explanation:

      Astrocytes are the supporting cells of the central nervous system. There are two types; the fibrous type is found in the white matter and the protoplasmic type in the grey matter. They are the most abundant cell type in the CNS.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      6.6
      Seconds
  • Question 39 - Glucose transport in the brain is mediated by: ...

    Incorrect

    • Glucose transport in the brain is mediated by:

      Your Answer: GLUT 3

      Correct Answer: GLUT 1

      Explanation:

      The facilitative glucose transporter mediates the transport of glucose from blood into neurons and glia in the brain. The primary isoforms in the brain are GLUT1 detected at high concentrations.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      11.5
      Seconds
  • Question 40 - On which presynaptic receptor does noradrenalin act to inhibit noradrenalin secretion? ...

    Incorrect

    • On which presynaptic receptor does noradrenalin act to inhibit noradrenalin secretion?

      Your Answer: Β3 receptor

      Correct Answer: Α2 receptor

      Explanation:

      Adregenic receptors are A1, A2, B1, B2, B3. Out of these, the function of the A2 receptor is inhibition of transmitter release including nor adrenalin and acetylcholine of the autonomic nervous system.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      4.2
      Seconds
  • Question 41 - Cold receptors are likely to be active at the following temperatures except? ...

    Incorrect

    • Cold receptors are likely to be active at the following temperatures except?

      Your Answer: 25 °C

      Correct Answer: 39 °C

      Explanation:

      Cold and Menthol receptor 1 (CMR1) is a protein that in humans is encoded by TRPM8 gene. It is primarily responsible for the detection of temperatures ranging from 8-28 C. It is an ion channel which upon activation causes the influx of Na+ and Ca+ ions into the cell that leads to the depolarization and generation of an action potential.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      28.5
      Seconds
  • Question 42 - The parasympathetic function of the facial nerve is: ...

    Incorrect

    • The parasympathetic function of the facial nerve is:

      Your Answer: Secretion of sweat from the sweat glands in the facial region

      Correct Answer: Secretion of tears from lacrimal glands, secretion of saliva from the sublingual and submandibular salivary glands.

      Explanation:

      Facial nerve (Cranial Nerve VII) has both sensory and motor components so it is a mixed nerve. It carries axons of:General somatic afferent – to skin and the posterior earGeneral visceral efferent – which innervate sublingual, submandibular and lacrimal glands and the mucosa of the nasal cavity.General visceral afferent – provide sensation to soft palate and parts of the nasal cavity.Special visceral efferent – innervate muscles of facial expression and stapedius, the posterior belly of the digastric and the stylohyoid musclesSpecial visceral afferent – provide taste to the anterior two-thirds of the tongue via chorda tympani.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      19.1
      Seconds
  • Question 43 - Choose the correct answer: The cerebrocerebellum… ...

    Incorrect

    • Choose the correct answer: The cerebrocerebellum…

      Your Answer: Receives input via the corticopontocerebellar tracts in the middle cerebellar peduncle

      Correct Answer: All options are correct

      Explanation:

      Cerebrocerebellum is comprised of two lateral regions, the cerebellar hemispheres and communicates with the cerebral cortex. It is principally responsible for controlling coordination of movement. Three fiber bundles carry the input and output of the cerebellum. There are three cerebellar peduncles with different connections and functions. The three are mainly, superior, middle and inferior. The superior cerebellar peduncle is also known as the “Brachium conjunctivum”. It predominantly contains efferent fibers from the cerebellar nuclei, as well as some afferents from the spinocerebellar tract. The efferent pathways include cerebellorubral, dentatothalamic, and fastigioreticular fibers. These are tracts projecting from the deep cerebellar nuclei to the thalamus and red nucleus. The middle cerebellar peduncle connects to the pontine nucleus and the dorsal spinocerebellar tracts run through the superior cerebellar peduncle

    • This question is part of the following fields:

      • Medicine
      • Neurology
      8.2
      Seconds
  • Question 44 - The small opening in the cochlea through which the upper scala vestibuli and...

    Correct

    • The small opening in the cochlea through which the upper scala vestibuli and lower scala tympani communicates is called the:

      Your Answer: Helicotrema

      Explanation:

      The helicotrema is the part of cochlear labyrinth where the scala tympani and the scala vestibuli meet.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      3.3
      Seconds
  • Question 45 - Regarding taste threshold and intensity discrimination: ...

    Incorrect

    • Regarding taste threshold and intensity discrimination:

      Your Answer: 50% change in concentration of substance tasted is necessary before an intensity difference can be detected

      Correct Answer: 30% change in concentration of substance tasted is necessary before an intensity difference can be detected

      Explanation:

      The ability of humans to differentiate differences in intensity of taste is poor. A 30% change in the concentration of the substance being tasted is required before an intensity difference is perceived.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      7.7
      Seconds
  • Question 46 - The Afferent neuron that supplies all sensory elements of the muscle spindle is...

    Correct

    • The Afferent neuron that supplies all sensory elements of the muscle spindle is what type of sensory neuron?

      Your Answer: Ia

      Explanation:

      Muscle spindle is supplied by both sensory and motor nerves. Sensory supply is Type Ia fibers whereas motor supply is gamma motor neurone.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      4.6
      Seconds
  • Question 47 - Which dorsal (sensory) root is responsible for umbilical area sensation? ...

    Incorrect

    • Which dorsal (sensory) root is responsible for umbilical area sensation?

      Your Answer: L5

      Correct Answer: T10

      Explanation:

      The area of skin supplied by one nerve is called a dermatome. T10 supplies sensory neurons to the area of the umbilicus. C3 and C4 supply the neck and the shoulder, T4 supplies the dermatome at the level of the nipple, S3 supplies the inguinal region and L5 supplies the lateral aspect of the leg and the medical aspect of the dorsum of the feet plus the first 3 toes.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      45.1
      Seconds
  • Question 48 - Choose the correct answer: fibers in the superior cerebellar peduncle: ...

    Incorrect

    • Choose the correct answer: fibers in the superior cerebellar peduncle:

      Your Answer: Are mainly dorsal spinocerebellar tracts to the cerebellum

      Correct Answer: Are mainly ventral spinocerebellar tracts from the cerebellar nuclei to the thalamus and red nucleus

      Explanation:

      There are three cerebellar peduncles with different connections and functions. The three are mainly, superior, middle and inferior. The superior cerebellar peduncle is also known as the “Brachium conjunctivum”. It predominantly contains efferent fibers from the cerebellar nuclei, as well as some afferents from the spinocerebellar tract. The efferent pathways include cerebellorubral, dentatothalamic, and fastigioreticular fibers. These are tracts projecting from the deep cerebellar nuclei to the thalamus and red nucleus. The middle cerebellar peduncle connects to the pontine nucleus and the dorsal spinocerebellar tracts run through the superior cerebellar peduncle.

      The superior cerebellar peduncle contains vital afferent and efferent fibers including cerebellothalamic, cerebellorubral and ventrospinocerebellar tracts.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      8
      Seconds
  • Question 49 - Which of the following receptors are found in the liver? ...

    Incorrect

    • Which of the following receptors are found in the liver?

      Your Answer: α1, α2, β1, β2

      Correct Answer: α1, β2

      Explanation:

      Liver consists of the sympathetic Alpha 1 and beta 2 receptors.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      11.1
      Seconds
  • Question 50 - The main reason for the prolonged effect of the withdrawal reflex is: ...

    Incorrect

    • The main reason for the prolonged effect of the withdrawal reflex is:

      Your Answer:

      Correct Answer: Multiple connections between afferent and efferent neurons

      Explanation:

      The withdrawal reflex is a spinal reflex that protects the body from harmful stimuli. Spinal reflexes are mostly monosynaptic and are mediated by a simple reflex arc. Withdrawal reflex is mediated by a polysynaptic reflex resulting in stimulation of many motor neurons in order to establish a quick and prolonged response.

    • This question is part of the following fields:

      • Medicine
      • Neurology
      0
      Seconds

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Neurology (30/49) 61%
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