Which cranial nerve innervates the superior oblique muscle?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which cranial nerve innervates the superior oblique muscle?

Explanation:
The nerve that innervates the superior oblique is the trochlear nerve, cranial nerve IV. This small motor nerve is dedicated to the superior oblique, enabling it to intort and depress the eye, especially when the eye is turned inward. Other nerves surrounding the eye have different roles: the oculomotor nerve supplies the majority of the extraocular muscles and the levator palpebrae, the abducens nerve goes to the lateral rectus, and the optic nerve carries vision rather than motor to the eye muscles. So the correct innervation for the superior oblique is cranial nerve IV.

The nerve that innervates the superior oblique is the trochlear nerve, cranial nerve IV. This small motor nerve is dedicated to the superior oblique, enabling it to intort and depress the eye, especially when the eye is turned inward. Other nerves surrounding the eye have different roles: the oculomotor nerve supplies the majority of the extraocular muscles and the levator palpebrae, the abducens nerve goes to the lateral rectus, and the optic nerve carries vision rather than motor to the eye muscles. So the correct innervation for the superior oblique is cranial nerve IV.

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