20.5 NS: Cranial nerves 1

Question 1

What cranial nerve controls muscles of mastication?

Answer 1

Mandibular division of Trigeminal (CN V)

Question 2

What are the somatic motor cranial nerves?

Answer 2

CN III
CN IV
CN VI
CN XII

Question 3

What are the branchial arch cranial nerves?

Answer 3

CN V (mandibular division)
CN VII
CN IX
CN X

Question 4

What is the nucleus ambiguus important for? Which cranial nerves (2) and which muscles? Where does it lie?

Answer 4

Mostly motor nucleus
Behind inferior olive

CN IX (stylopharyngeus)
CN X (levator palati)

Question 5

What are 4 nuclei that are needed for motor innervation to smooth msucles (visceral efferents) and which cranial nerves do they innervate?

Answer 5

Edinger-Westphal nucleus: CNIII
Superior salivatory nucleus: CNVII
Inferior salivatory nucleus: CNIX
Dorsal motor nucleus of the vagus: CNX

Question 6

Where is the visceral afferent nucleus? What Does it get input from?

Answer 6

Medulla

Input from:
(special visceral afferent, taste)- CN VII, IX, X

Autonomic: X, IX

Question 7

What nucleus is important for general visceral sensation? Where does it extend?

Answer 7

Nucleus solitarius

From pons to nucleus gracilis

Question 8

What are the rostral and caudal contents of the nucleus solitarius?

Answer 8

Rostral: gustatory nucleus (primary afferents, taste buds/palate input, VII )

Caudal: visceral sensory division (X, heart, IX baro/chemoreceptors from carotid body/sinus)

Question 9

What nerves are somatic sensory?

Answer 9

Face etc. CNV

Skin behind ear/external auditory meatus. CNVII, CNIX, CNX

Question 10

What nerves are special sensory?

Answer 10

CN I, CNII, CNVIII