CN X (Vagus)

Question 1

CN X is a mixed nerve which means what?

Answer 1

It has motor, sensory and parasympathetic functions.

Question 2

The special visceral efferent component is derived from what?

Answer 2

Nucleus Ambiguus (branchomotor)

Question 3

The general visceral efferent component is from what?

Answer 3

Dorsal Motor Nucleus of CN X (visceromotor)

Question 4

The general somatic afferent component is related to what?

Answer 4

Spinal Nucleus of CN V (sensory)

Question 5

The general visceral afferent fibers go to what?

Answer 5

Solitary nucleus (sensory)

Question 6

The special visceral afferent fibers go from what to what?

Answer 6

Base of tongue to solitary nucleus (taste)

Question 7

CN X leave the brain stem in the groove between what?

Answer 7

Olive and Cerebellum

Question 8

CN X passes through what?

Answer 8

Jugular foramen after if gives off tympanic branch

Question 9

The tympanic branch enters the middle ear cavity to form what?

Answer 9

Tympanic plexus

Question 10

Below the jugular foramen CN X passes between what?

Answer 10

Superior and Middle Constrictors

Question 11

CN X breaks up into it’s terminal branches to supply what?

Answer 11

Root of tongue
Tonsils and muscles
Mucosa of pharynx

Question 12

The vagus N passes through neck and thorax and ends where?

Answer 12

Abdomen

Question 13

CN X carries parasympathetic innervation to what?

Answer 13

Thorax and abdomen as far as transverse colon

Question 14

CN X also carries sensory fibers from where?

Answer 14

Thorax and Abdomen

Question 15

The ratio of afferent (Sensory) and efferent (Motor) fibers in the vagus N is what?

Answer 15

10:1