VII Facial

Question 1

origins of facial nerve

Answer 1

• facial nucleus: lower pons, level of facial colliculus (motor)
• nucleus of solitary tract (taste & parasympathetic)
• superior salivatory nucleus (parasympathetic)

Question 2

what structures form the sensory root to the facial nerve? (Nervous intermedius)

Answer 2

preganglionic parasympathetic fibers from superior salivatory nucleus and central axons of geniculate ganglion carrying taste from anterior 2/3 of tongue

Question 3

where does facial nerve exit the brain?

Answer 3

cerebellopontine angle

Question 4

name the peripheral branches of facial nerve

Answer 4

temporal
zygomatic
buccal
marginal mandibular
cervical

Question 5

motor functions of facial nerve

Answer 5

• muscles of facial expression
• auricular muscles
• stapedius
• posterior belly of digastric & stylohyoid muscles

Question 6

sensory function of facial nerve

Answer 6

taste from anterior 2/3 of tongue

Question 7

parasympathetic function of facial nerve

Answer 7

• lacrimal glands
• mucous and serous glands of nasopharynx
• submandibular & sublingual salivary glands (via chorda tympani)

Question 8

what structures form the greater petrosal nerve?

Answer 8

preganglionic parasympathetic fibers from the nervous intermedius

Question 9

what structures form the nerve to the pterygoid canal (vidian nerve)?

Answer 9

greater petrosal nerve joined by sympathetic fibers from the deep petrosal nerve

Question 10

where does the vidian nerve synapse?

Answer 10

pterygo(spheno)palatine ganglion

Question 11

The pterygopalatine ganglion sends postganglionic fibers…

Answer 11

A. Maxillary nerve —> Zygomaticotemporal nerve (V2) —> Lacrimal nerve to supply lacrimal gland

B. Via palatine nerves to serous & mucous glands of soft and hard palate and nasopharynx

Question 12

Preganglionic parasympathetic fibers from nervous intermedius travel with the ____ through the ____ where they join the ____ on their way to the submandibular ganglion

Answer 12

Facial nerve
Internal acoustic meatus
Chorda tympani

Question 13

Chorda tympani exits the ear cavity through the ____ and joins the ____ to supply the _____

Answer 13

Petrotympanic fissure
Lingual nerve (V3)
Submandibular ganglion

Question 14

Postganglionic fibers from the submandibular ganglion supply the _____

Answer 14

Submandibular and sublingual salivary glands

Question 15

Taste fibers from the anterior 2/3 of the tongue join the ____ in the mouth and go back to ____

Answer 15

Chorda tympani
Back to their cell bodies (geniculate ganglion)

Question 16

Central axons from the geniculate ganglion join the ____ on their way to synapse with the ____

Answer 16

Nervous intermedius
Solitary nucleus

Question 17

Examination of facial nerve

Answer 17

Facial expression movements and taste

Question 18

Lesion of facial nerve

Answer 18

Bell’s palsy LMN type of facial paralysis
(Hyperacousis, unilateral facial paralysis with inability to wrinkle forehead, raise eyebrow, shut eye, smile; tear flow over sagging lower eyelid, loss of taste ant 2/3 tongue)

Question 19

An UMN type of facial paralysis involves the ____ half of the face

Answer 19

Contralateral lower half

Question 20

Facial nerve enters the internal acoustic meatus and exits the skull via the ____

Answer 20

Stylomastoid foramen