Facial n. (CN VII)

Question 1

Branches in the facial canal

-N. to the stapedius

Answer 1

function- motor innervation of the stapedius muscle

Question 2

Branches in the facial canal

-Chorda tympani n.

Answer 2

function- sensory (taste) innervation of the mucosa of the anterior 2/3rds of the tongue [taste axons join the lingual nerve to innervate the mucosa of the tongue], and preganglionic parasympathetic innervation of the submandibular ganglion

Question 3

Greater petrosal n.

Answer 3

function- preganglionic parasympathetic (superior salivatory nucleus of the pons) innervation of the pterygopalatine ganglion

i. with the deep petrosal nerve forms the Nerve of the pterygoid canal

function- postganglionic sympathetic and preganglionic parasympathetic innervation of the pterygopalatine ganglion

Question 4

Branches at the stylomastoid foramen

-Nerve to the stylohyoid m.

Answer 4

function- motor (facial motor nucleus of the pons) innervation of the stylohyoid muscle

Question 5

Branches at the stylomastoid foramen

-Nerve to the posterior digastric m.

Answer 5

function- motor (facial motor nucleus of the pons) innervation of the posterior belly of the digastric muscle

Question 6

Branches on the face

-Temporal branch

Answer 6

function- motor (facial motor nucleus of the pons) innervation of the frontalis and orbicularis oculi muscles

Question 7

Branches on the face

-Zygomatic branch

Answer 7

function- motor (facial motor nucleus of the pons) innervation of the orbicularis oculi, zygomaticus major and levator labii superioris muscles

Question 8

Branches on the face

-Buccal branch

Answer 8

function- motor (facial motor nucleus of the pons) innervation of the buccinator, levator labii superioris, nasalis, orbicularis oris, depressor anguli oris & zygomaticus major muscles

Question 9

Branches on the face

-Marginal mandibular branch

Answer 9

function- motor (facial motor nucleus of the pons) innervation of the depressor anguli oris & orbicularis oris muscles

Question 10

Branches on the face

-Cervical branch

Answer 10

function- motor (facial motor nucleus of the pons) innervation of the platysma muscle