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  • Question 1 - Oculomotor (CN III) palsy with sparing of the pupillary reflex is most likely...

    Correct

    • Oculomotor (CN III) palsy with sparing of the pupillary reflex is most likely caused by which of the following:

      Your Answer: Diabetes mellitus

      Explanation:

      Compressive causes of CN III palsy cause early pupillary dilatation because the parasympathetic fibres run peripherally in the nerve and are easily compressed. In diabetes mellitus the lesions are ischaemic rather than compressive and therefore typically affect the central fibres resulting in pupillary sparing.

    • This question is part of the following fields:

      • Anatomy
      • Cranial Nerve Lesions
      2.6
      Seconds

  • Question 2 - A patient presents with an adducted eye at rest which cannot abduct past...

    Correct

    • A patient presents with an adducted eye at rest which cannot abduct past the midline, which of the following cranial nerves is most likely to be affected:

      Your Answer: Abducens nerve

      Explanation:

      Abducens nerve palsies result in a convergent squint at rest (eye turned inwards) with inability to abduct the eye because of unopposed action of the rectus medialis. The patient complains of horizontal diplopia when looking towards the affected side. With complete paralysis, the eye cannot abduct past the midline.

    • This question is part of the following fields:

      • Anatomy
      • Cranial Nerve Lesions
      6.4
      Seconds

  • Question 3 - A 35-year-old lady has suffered a serious brain injury. Her uvula has deviated...

    Incorrect

    • A 35-year-old lady has suffered a serious brain injury. Her uvula has deviated to the right, according to inspection. Which of the following nerves is likely to be affected?

      Your Answer: Left hypoglossal nerve

      Correct Answer: Left vagus nerve

      Explanation:

      When the vagus nerve is damaged, the soft palate is paralyzed and the uvula is shifted away from the affected side. The vagus nerve innervates the uvulae muscle, which forms the uvula’s core. If only one side is innervated, contraction of the active muscle will draw the uvula towards it.

    • This question is part of the following fields:

      • Anatomy
      • Cranial Nerve Lesions
      6.6
      Seconds

  • Question 4 - Which of the following clinical features is NOT typical of a facial nerve...

    Correct

    • Which of the following clinical features is NOT typical of a facial nerve palsy:

      Your Answer: Inability to raise the eyelid

      Explanation:

      Facial nerve palsy can result in inability to close the eye due to paralysis of the orbicularis oculi muscle. Elevation of the eyelid in eye opening is a function of the levator palpebrae superioris muscle and the superior tarsal muscle, innervated by the oculomotor nerve and the sympathetic chain respectively.

    • This question is part of the following fields:

      • Anatomy
      • Cranial Nerve Lesions
      7.7
      Seconds

  • Question 5 - A 62 year old man has sustained a penetrating injury to the submandibular...

    Correct

    • A 62 year old man has sustained a penetrating injury to the submandibular triangle. On examination, his tongue is weak and when protruded deviates to the left. Which of the following nerves has most likely been injured:

      Your Answer: Left hypoglossal nerve

      Explanation:

      Damage to the hypoglossal nerve results in weakness of the tongue, with deviation of the tongue towards the weak side on protrusion.

    • This question is part of the following fields:

      • Anatomy
      • Cranial Nerve Lesions
      6.6
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Anatomy (4/5) 80%
Cranial Nerve Lesions (4/5) 80%
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