SM_10b: Overview of the Cranial Nerves: XI-XII

Question 1

Spinal accessory nerve (XI) exits the ____ in line with nerves ____ and ____

Answer 1

Spinal accessory nerve (XI) exits the jugular canal in line with nerves IX and X

Question 2

Cranial root of XI is tested as part of ____

Answer 2

Cranial root of XI is tested as part of vagus nerve

Question 3

Accessory nerve (XI) spinal root paralysis results in ____ and ____

Answer 3

Accessory nerve (XI) spinal root paralysis results in wasting of trapezius / sternocleidomastoid muscles and inability to shrug the shoulders (elevate the shoulder girdle)

Question 4

Primordium of spinal accessory nerve (XI) is ___

Answer 4

Primordium of spinal accessory nerve (XI) is somitic mesoderm by arch 6

Question 5

Hypoglossal nerve exits the ____

Answer 5

Hypoglossal nerve exits the hypoglossal canal

Question 6

Hypoglossal nerve (XII) is ____ to tongue muscles, including ____, ____, ____, and ____

Answer 6

Hypoglossal nerve (XII) is somatomotor to tongue muscles, including intrinsic, genioglossus, hyoglossus, and styloglossus

Question 7

C1 spinal nerve fibers travel with ____ nerve to ____ and ____

Answer 7

C1 spinal nerve fibers travel with hypoglossal nerve (XII) to thyrohyoid and superior root of ansa cervicalis

(head somites in line with rest of somites)

Question 8

If hypoglossal nerve does not work, tongue deviates to the ____

Answer 8

If hypoglossal nerve does not work, tongue deviates to the non-working side

(genioglossus protrudes tongue)

(left CN XII is nonfunctional is this image)

Question 9

Primordium of hypoglossal nerve (XII) is ____

Answer 9

Primordium of hypoglossal nerve (XII) is post-otic somites