muscles of the head

Question 1

Name the muscle responsible for supporting the cheeks and returning food the the central cavity when it has escaped to the vestibule

Answer 1

buccinator

Question 2

What does the fascial nerve innervate?

Answer 2

orbicularis oris

levator nasolabia

depressor nasolabia inferior

Question 3

What is the function of the chorda tymapni branch of the fascial nerve ?

Answer 3

provides sensation for the rostral 2/3 of the tongue

Question 4

what nerve supplies the extrinsic and intrinsic muscles of the tongue?

Answer 4

hypoglossal nerve

sensory: lingual

Question 5

name the origin and insertion of the temporalis muscle

Answer 5

lateral cranium

coronoid processs

Question 6

name the muscles involved in the closure of the jaw

Answer 6

temporalis

masseter

pterygoideus

Question 7

name the origin and insertion of the masseter muscle

Answer 7

origin: zygomatic arch and maxillary region skull
insertion: caudal part of mandible (Ramus)

Question 8

name the muscles responsible for the opening of the jaw

Answer 8

digastricus

sternocephalicus (some species have a mandibular component)

Question 9

What muscle forms a functional pair with the masseter in herbivorous animals

Answer 9

pterygoideus: draws jaw inwards with some simulatenous protrusion

Question 10

During the resting position, why does the mouth remain closed?

Answer 10

1. tonic activity of masticatory muscles

2. hermatic seal created from resting tongue on the hard palate

Question 11

what is the hermatic seal?

Answer 11

the seal created from resting the tongue on the hard palate

Question 12

how do the upper and lower teeth sit relative to each other during rest?

Answer 12

separation and interrupted contact between upper and lower tooth rows