Hypoglossal nerve CN XII

Question 1

Through which canal does the hypoglossal nerve exit the skull?

Answer 1

Hypoglossal canal

Question 2

Which muscle does the main branch of the hypoglossal nerve (nervus hypoglossus) innervate with fibers from the first cervical spinal nerve C1?

Answer 2

The thyrohyoid muscle

Question 3

WHich bloodvessels is the CNXII closely related to in the retrostyloid space?

Answer 3

Internal jugular vein and the internal carotid artery

Question 4

Which cranial nerve crosses the external carotid artery (arteria carotis externa) before it branches to give off its terminal branches?

Answer 4

The hypoglossal nerve

Question 5

What sign is seen of the tongue when the left hypoglossal nerve is injured?

Answer 5

A right deviation of the tongue due to weak left side.

Question 6

From which nucleus do the efferent motor fibers of the hypoglossal nerve (nervus hypoglossus, CN XII) stem?

Answer 6

The nucleus of the hypoglossal nerve

Question 7

The hypoglossal nerve (nervus hypoglossus, CN XII) takes part in forming which of the following nerve structures?

Answer 7

Ansa Cervicalis

Question 8

Which cranial nerve nuclei communicate with the nucleus of the hypoglossal nerve and therefore participate in reflex movements of the tongue?

Answer 8

*The principal sensory nucleus of the trigeminal nerve
* Nucleus of solitary tract

Question 9

Which nervous structure follows CNXII for about 2cm after exiting the cranium?

Answer 9

cervical plexus