Question

which cranial nerve innervates the superior rectus muscle?
oculomotor (cn 3)
trochlear (cn 4)
abducens (cn 6)
facial (cn 7)

Explanation:

The oculomotor nerve (CN 3) is responsible for innervating several extra - ocular muscles, including the superior rectus muscle. The trochlear nerve (CN 4) innervates the superior oblique muscle. The abducens nerve (CN 6) innervates the lateral rectus muscle. The facial nerve (CN 7) is mainly involved in facial expression muscles and not extra - ocular muscles like the superior rectus.

Answer:

Oculomotor (CN 3)