CN III, IV, and VI: Control of Eye Movements

Question 1

Name the function of CN III, the occulomotor nerve?

Answer 1

SOMATIC MOTOR

Question 2

Name the muscles CN III: the occulomotor nerve, innervates?

4 in total

Answer 2

EXTRINSIC MUSCLES OF EYE (L - R)
+
LEVATOR PALPEBRAE SUPERIORIS (lifts upper eyelid)
+
CILIARY MM (adjusts lens of the eye)
+
SPHINCTER PUPILLAE (constricts the pupil)

CN 3

Question 3

What muscle does CN IV: the trochlear nerve, give motor input to?

Answer 3

SUPERIOR OBLIQUE MM (turns eye downward)

CN 4

Question 4

What muscle does CN VI: the abducens nerve, give motor input to?

Answer 4

LATERAL RECTUS MM (abducts eye)

CN 6