Muscle and gland innervation and action

Question 1

Platysma

Answer 1

facial n, draw lips caudally

Question 2

orbicularis oris

Answer 2

dorsal and ventral buccal branches of the facial n.

Closes mouth

Question 3

buccinator

Answer 3

Dorsal and ventral buccal branches of the facial n.

Tenses cheek to compress the oral vestibule

Question 4

levator nasolabialis

Answer 4

Auriculopalpebral branch of the facial n.

Lifting of upper lip

Question 5

orbicularis oculi

Answer 5

Auriculopalpebral branch of the facial n.

Forceful closure of the eye

Question 6

temporalis

Answer 6

mandiublar division of trigeminal. raise mandible (shut jaw)

Question 7

masseter

Answer 7

Mandibular division of the trigeminal n.
Raise mandible (Shut the jaw)

Question 8

pterygoid

Answer 8

Mandibular division of the trigeminal n.
Raise mandible (Shut the jaw)

Question 9

digastricus

Answer 9

Facial n. and Mandibular division of the trigeminal n.

Open mouth

Question 10

styloglossus

Answer 10

Hypoglossal n.

Lift and draw tongue caudal (Move tongue)

Question 11

hyoglossus

Answer 11

Hypoglossal n.

Depress and draw tongue caudal (Move tongue)

Question 12

genioglossus

Answer 12

Hypoglossal n.

Depress and protrude tongue (Move tongue)

Question 13

sternohyoid

Answer 13

Cervical spinal nn.

Draw tongue and larynx caudally

Question 14

thyrohyoid

Answer 14

hypoglossal n.

Draw hyoid apparatus caudally

Question 15

mylohyoid

Answer 15

Mandibular division of the trigeminal n.

Draw hyoid apparatus cranially, lift floor of the mouth

Question 16

geniohyoid

Answer 16

Hypoglossal n.

Draw hyoid apparatus and larynx rostrally

Question 17

cricopharyngeus

Answer 17

Constriction of caudal pharynx; functionally, acts as the cranial esophageal sphincter (Moves bolus back into esophagus)

Question 18

thyropharyngeus

Answer 18

Glossopharyngeal and vagus nn.

Constriction of middle pharynx (Moves bolus back into esophagus)

Question 19

hyopharyngeus

Answer 19

Glossopharyngeal and vagus nn.

Constriction of rostral pharynx (Moves bolus back into esophagus)

Question 20

lacrimal gland

Answer 20

Innervation:
Afferent: Trigeminal n. (Zygomatic?)
Efferent: Facial n.

Question 21

salivary gland

Answer 21

facial nerve