Muscles of Facial Expression

Question 1

orbicularis oris

Answer 1

• sphincter muscle

- closes the mouth

Question 2

buccinator

Answer 2

• maxilla/mandible to angle of mouth
• lateral wall of oral cavity
• functions in mixing/mastication
• synergist w tongue in bolus formation

Question 3

platysma

Answer 3

• base of neck to mandible

- tense neck skin and depress jaw (synergist w lateral pterygoid)

Question 4

overall action of the orbicularis oculi

Answer 4

close the eyelids

Question 5

what are the 2 parts of the orbicularis oculi and what do they do?

Answer 5

• palpebral = soft close (in eyelids)

- orbital = hard close (around eyelids; makes you squint)

Question 6

nasalis

Answer 6

flare nostrils

Question 7

tongue muscles are all innervated by ______

Answer 7

CN 12 (hypoglossal)

Question 8

extrinsic tongue muscles

Answer 8

• move the tongue

- protract/retract, ABD/ADD, elevate/depress

Question 9

intrinsic tongue muscles

Answer 9

• change the shape of the tongue

- curl, flatten/narrow, shorten/elongate