Which of the following extraocular muscles is/are innervated by the oculomotor nerve?I. Superior rectusII. Inferior rectusIII. Levator palpebrae superiorisIV. Medial rectus
Question
Which of the following extraocular muscles is/are innervated by the oculomotor nerve?I. Superior rectusII. Inferior rectusIII. Levator palpebrae superiorisIV. Medial rectus
Solution
The oculomotor nerve (Cranial Nerve III) innervates the following extraocular muscles:
I. Superior rectus - Yes, the superior rectus muscle is innervated by the oculomotor nerve. This muscle primarily helps the eye look upward.
II. Inferior rectus - Yes, the inferior rectus muscle is also innervated by the oculomotor nerve. This muscle primarily moves the eye downward.
III. Levator palpebrae superioris - Yes, the levator palpebrae superioris is innervated by the oculomotor nerve. This muscle elevates the upper eyelid.
IV. Medial rectus - Yes, the medial rectus muscle is innervated by the oculomotor nerve. This muscle moves the eye inward, towards the nose.
So, all four muscles listed (Superior rectus, Inferior rectus, Levator palpebrae superioris, and Medial rectus) are innervated by the oculomotor nerve.
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