Exam 2 CN XII

Question 1

The hypoglossal nerve carries exclusively what fibers

Answer 1

Motor

Question 2

hypoglossal nerve is the only nerve to supply what

Answer 2

Intrinsic and extrinsic muscles of the tongue with exception of palatoglossus

Question 3

Where are the cell bodies located for the hypoglossal nerve

Answer 3

Within the nucleus of the hypoglossal nerve

Question 4

The nucleus of the hypoglossal nerve is located where

Answer 4

The floor of the rhomboid fossa

Question 5

Where does the hypoglossal nerve emerge as a series of rootlets

Answer 5

Pyramid and olive of the MO combining to form two bundles

Question 6

Where does the bundle of the hypoglossal nerve rootlets exit the skull from

Answer 6

Hypoglossal canal as separate entities that then combine upon exiting the canal

Question 7

What does the hypoglossal nerve form after descending

Answer 7

Forms a loop called the arch of the hypoglossal nerve

Question 8

What does the arch of the hypoglossal nerve reach

Answer 8

Base of the tongue

Question 9

After descending and forming the arch of the hypoglossal nerve fibers do what

Answer 9

Distribute into terminal branches supplying the muscles of the tongue

Question 10

What fibers travel with but do not combine with hypoglossal nerve and what will they form

Answer 10

C1 and C2 and separate to form the superior root of the ansa cervicalis

Question 11

Lingual branches off the hypoglossal nerve supply what

Answer 11

Hypoglossus, genioglossus, and styloglossus muscles

Question 12

Some cervical fibers will continue with hypoglossal nerve to ultimately supply what muscles

Answer 12

Geniohyoid and thyrohyoid muscles

Question 13

What is hemiatrophy (unilateral)

Answer 13

• when you stick your tongue out, deviates towards the involved side
• affected side = no extended muscles
• swallowing = larynx may deviate towards normal side, look at the adams apple