INNERVATION OF THE FACE

Question 1

innervation of the face

Answer 1

BY:

1. the trigeminal nerve (CN V) innervates facial structures derived from the first arch- (cutaneous innervation)
2. facial nerve(CN VII) innervates facial structures derived from the second arch- ( motor innervation)

Question 2

the face

Answer 2

is primarily derived from the first and the second pharyngeal arches

Question 3

cutaneous innervation

Answer 3

1. it is bt the trigeminal nerve

divides into 3 major divisions leaving the middle cranial fossa

A. ophthalmic nerves (CN V1)
B. maxillary nerve (CN V2)
C. mandibular nerve (CN V3)

2. the first two are sensory only
3. the last division is largely sensory nut also receives motor fibers

Question 4

cutaneous branches of cervical nerves

Answer 4

1. from the cervical plexus extend over the posterior aspect of the neck and scalp

Question 5

the greater auricular nerve

Answer 5

1. innervates the inferior aspect of the auricle(ear) and much of parotid region of the face

Question 6

motor innervation

Answer 6

1. by facial nerves
2. CN VII
3. facial nerve emerges from the cranium through the stylomastoid foramen located between the styloid process and the mastoid.
4. it immediately gives off the posterior auricle nerve which supplies auricles posterior and occipital belly of the occipitofrontalis muscles
5. facial nerve trunk runs anteriorly and is engulfed by the parotid gland which forms the parotid plexus

Question 7

parotid plexus

Answer 7

1. give rise to five terminal branches of the facial nerve

a. temporal
b. zygomatic
c. buccal
d. marginal mandibular
e. cervical

Question 8

the temporal branch of the facial nerve

Answer 8

1. supply frontal belly of occipitofrontalis

2. and the superior part of the orbicularis oculi

Question 9

the zygomatic branch

Answer 9

1. supplies orbicularis oculi

2. part inferior to the orbit

Question 10

the buccal branch

Answer 10

1. supplies the buccinator

2. and the muscles of the upper lip

Question 11

marginal mandibular branch

Answer 11

1. supplies risorius

2. and muscles of the lower lip and chin

Question 12

cervical branch

Answer 12

supplies the platysma