Muscles of Head

Question 1

Major Functional Muscles of Face and Scalp (5)

Answer 1

occipitofrontalis
orbicularis oculi
orbicularis oris
buccinator
platysma

Question 2

Occipitofrontalis (frontal belly) - A

Answer 2

elevates eyebrows
wrinkles forehead
protracts scalp (surprise/curiosity)

Question 3

Occipitofrontalis (occipital belly) - A

Answer 3

retracts scalp

Question 4

Orbicularis oculi - A

Answer 4

closes eyelids (winking)

Question 5

Orbicularis oris - A

Answer 5

compresses and protrudes lips (kissing)

Question 6

Buccinator - A

Answer 6

tenses cheek

Question 7

Muscles of Mastication (4)

Answer 7

temporalis
masseter
lateral pterygoid
medial pterygoid

Question 8

Temporalis - A

Answer 8

elevates mandible, closing jaws

posterior horizontal fibers retract mandible

Question 9

Masseter - A

Answer 9

elevates mandible

superficial fibers contribute to mandible protrusion

Question 10

Lateral Pterygoid - A

Answer 10

bilateral: protracts mandible and depresses chin
unilateral: swings jaw to contralateral side
alternating unilateral activity: large lateral chewing (like a cow)

Question 11

Medial Pterygoid - A

Answer 11

synergist with masseter to elevate mandible
contributes to protrusion
alternating unilateral activity: small grinding movements