Ocular and auditory anatomy including extraocular muscles and middle/inner ear structures for USMLE Step 1.
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- Which cranial nerve innervates the lateral rectus muscle?
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Cranial nerve VI (abducens)- Which cranial nerve innervates the superior oblique muscle?
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Cranial nerve IV (trochlear)- Besides the lateral rectus and superior oblique, which cranial nerve innervates every other extraocular muscle?
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Cranial nerve III (oculomotor)- What is the primary action of the lateral rectus muscle?
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Abduction of the eye- What is the primary action of the medial rectus muscle?
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Adduction of the eye- In what position of gaze is the superior rectus best isolated for testing elevation?
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Abduction- In what position of gaze is the inferior rectus best isolated for testing depression?
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Abduction- In what position of gaze does the superior oblique best depress the eye?
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Adduction- In what position of gaze does the inferior oblique best elevate the eye?
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Adduction- Which cranial nerve has the longest intracranial course of any cranial nerve?
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Cranial nerve IV (trochlear nerve)- Through what fibrous pulley does the superior oblique tendon pass?
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The trochlea- A complete CN III palsy classically places the resting eye in what position?
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Down and out- An isolated CN VI palsy causes what deviation of the affected eye?
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Medial deviation (esotropia), from unopposed medial rectus- A patient with a CN IV palsy often tilts the head in which direction to compensate?
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Away from the side of the lesion- Which cranial nerve innervates the levator palpebrae superioris?
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Cranial nerve III (oculomotor)
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