Question

Match the muscle with its mechanical action and the nerve that innervates it:

a) Medial rectus - Oculomotor (CN III)
b) Corrugator supercilii - Facial (CN VII)
c) Adductor pollicis - Median (C6-T1)
d) Orbicularis oculi - Facial (CN VII)

Answer 1

The oculomotor nerve (CN III) innervates the medial rectus muscle, which is responsible for inward movement of the eye. Match a) Medial rectus with Oculomotor (CN III).

Step-by-step explanation:

The oculomotor nerve (CN III) innervates the medial rectus muscle. This muscle is responsible for adduction or inward movement of the eye. The oculomotor nerve also controls all the other extraocular muscles except for the lateral rectus (abduction) and superior oblique (intorsion), which are innervated by the abducens (CN VI) and trochlear (CN IV) nerves, respectively. The correct match for the muscle and nerve is:

a) Medial rectus - Oculomotor (CN III)

b) Corrugator supercilii - Facial (CN VII)
c) Adductor pollicis - Median (C6-T1)
d) Orbicularis oculi - Facial (CN VII)