Cranial Nerves: Part 2

Question 1

Which is the only cranial nerve to exit from the dorsal surface of the brain?

Answer 1

trochlear nerve

Question 2

Which cranial nerve is the longest overall?

Answer 2

vagus

Question 3

Which cranial nerve has the longest intracranial course?

Answer 3

trochlear

Question 4

Which muscle does the trochlear nerve innervate?

Answer 4

superior oblique eye muscle

Question 5

Which branch of the trigeminal has a motor component?

Answer 5

mandibular (V3) - SVE to muscles of mastication, anterior belly of digastric, mylohyoid, tensor tympani, tensor palatini

Question 6

Which muscle does the abducent nerve innervate?

Answer 6

lateral rectus muscle of the eye

Question 7

Which are the cranial nerves that are of branchial origin?

Answer 7

V, VII, IX, X/XI (corresponding to arches 1, 2, 3, and 4/6)

Question 8

A raging ear infection sends GVA fibers through which nerve?

Answer 8

CN IX

Question 9

All muscles ending with “glossus” are innervated by CN____, with the exception of which muscle (and what is it innervated by?

Answer 9

XII; exception is palatoglossus (CN X)

Question 10

All muscles of vocalization are innervated by which cranial nerve?

Answer 10

X (specifically, recurrent laryngeal branch)

Question 11

All glands of the face are innervated by____ with the exception of _____, which is innervated by_____.

Answer 11

CN VII; parotid gland; CN IX

Question 12

Injury of CN XI results in what clinically?

Answer 12

• Loss of ipsilateral shoulder shrug (due to impaired function of trapezius)
• Loss of ability to turn head to contralateral side (due to impaired function of SCM)

Question 13

Lesion of the right CN XII would cause atrophy of which part of the tongue?

Answer 13

right side

Question 14

Which nerve gives C1-3 fibers to the strap muscles (infrahyoids)?

Answer 14

CN XII (travels along with C1)