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Question 1
Correct
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Question 2
Correct
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Which one of the following muscles is the most important muscle forming the pelvic floor?
Your Answer: Levator ani
Explanation:Levator ani muscle is composed of three different muscles i.e. iliococcygeus, pubococcygeus and the puborectalis muscle. It is the main muscle that supports the organs of the pelvic cavity.
Bulbocavernosus and Ischiocavernosus muscles are located in-between the anus and scrotum and play an important role in sexual response in males.
Superficial and deep transverse perineal muscles are located in the perinium and pass in front of the anus. -
This question is part of the following fields:
- Anatomy
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Question 3
Correct
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Bladder contraction during voiding (micturating) is mediated via innervation of which of the following pathways?
Your Answer: Parasympathetic fibres from S2,S3,S4 nerve roots
Explanation:Detrusor contraction is via Parasympathetic innervation of pelvic splanchnic nerves (S2-4). This also causes relaxation of the internal urethral sphincter Note contraction and relaxation of the external urethral sphincter is under somatic control.
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This question is part of the following fields:
- Anatomy
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Question 4
Incorrect
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Which spinal segment is the lumbar plexus derived from?
Your Answer: L1-L5
Correct Answer: T12-L4
Explanation:The lumbar plexus is formed via contributions from the T12-L4 spinal cord segment. The plexus is responsible for the motor and sensory innervation of portions of the lower extremities and some parts of the lower abdomen and pelvis. Nerves arising from the plexus include the Iliohypogastric, ilioinguinal, genitofemoral, lateral femoral cutaneous, femoral nerve, obturator, and nerve to the lumbosacral trunk.
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This question is part of the following fields:
- Anatomy
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Question 5
Correct
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Sensory supply to the clitoris is via branches of which nerve?
Your Answer: Pudendal nerve
Explanation:The pudenal nerves has three branches, namely the inferior rectal, perineal and the dorsal nerve of the clitoris. The perineal nerve has two branches: The superficial perineal nerve gives rise to posterior scrotal or labial (cutaneous) branches, and the deep perineal nerve supplies the muscles of the deep and superficial perineal pouches, the skin of the vestibule, and the mucosa of the inferior most part of the vagina. The inferior rectal nerve communicates with the posterior scrotal or labial and perineal nerves. The dorsal nerve of the penis or clitoris is the primary sensory nerve serving the male or female organ, especially the sensitive glans at the distal end.
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This question is part of the following fields:
- Anatomy
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Question 6
Correct
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Which of the following statements regarding the Vaginal artery is typically TRUE?
Your Answer: It arises from the Internal iliac artery
Explanation:The Vaginal artery, like the Uterine artery is typically a branch of the Internal Iliac artery. It can sometimes arise as a branch of the Uterine artery so it is important to read the question (if the stem stated it CAN arise from the Uterine artery then that would be true)
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This question is part of the following fields:
- Anatomy
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Question 7
Correct
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If your patient is 8 weeks pregnant which one of the following USS measurements is most useful?
Your Answer: Crown rump length
Explanation:Fetal crown-rump length (CRL) is recommended over last menstrual period for estimating GA when measured in early pregnancy i.e. before 9 to 13+6 weeks.
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This question is part of the following fields:
- Anatomy
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Question 8
Correct
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The ovarian artery is a branch of the:
Your Answer: Aorta
Explanation:The ovarian artery is an artery that supplies oxygenated blood to the ovary in females. It arises from the abdominal aorta below the renal artery. It can be found in the suspensory ligament of the ovary, anterior to the ovarian vein and ureter.
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This question is part of the following fields:
- Anatomy
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Question 9
Incorrect
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Which cell type of the testis secrete inhibin?
Your Answer: Leydig cells
Correct Answer: Sertoli cells
Explanation:Summary points of the two key testicular cell types:
1. Sertoli Cells = Secrete Inhibin. Forms blood-testis barrier. Have FSH receptors
2. Leydig Cells = Secrete testosterone. Have LH receptors -
This question is part of the following fields:
- Anatomy
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Question 10
Incorrect
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Which two nerves provide the primary cutaneous sensory innervation to the labia majora?
Your Answer: Pudendal and perineal
Correct Answer: Ilioinguinal and pudendal
Explanation:The Pudendal provides cutaneous innervation to the posterior external genitalia via one of its terminal branches called the perineal nerve (this further branches into the posterior labial nerves or posterior scrotal nerve in men). The ilioinguinal nerve provides anterior sensation via the anterior labial nerves (anterior scrotal nerve in men). The genital branch of the genitofemoral nerve contributes some fibres to the skin of the mons pubis and labia majora in females. The posterior cutaneous nerve of thigh sometimes overlaps sensory areas.
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This question is part of the following fields:
- Anatomy
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