Quiz 2- Head & Face

Buccinator

Action: contracts cheeks to narrow mouth/food bolus

Depressor Anguli Oris

Action: Depresses and pulls corner of mouth inferiorly and laterally (frown)

Depressor Labii Inferioris

Action: Depresses and protrudes lower lip; pulls lip laterally (shows lower teeth)

Levator Anguli Oris

Action: Elevates corner of mouth (bilateral-smile, unilateral-smirk)

Levator Labii Superioris

Actions: Elevates and protrudes upper lip (shows upper teeth)

Mentalis

Action: Elevates medial chin skin; protrudes lower lip (pout)

Orbicularis Oris

Action: Closes and shapes lips

Platysma

Action: Depresses jaw and corners of mouth; tightens neck fascia

Risorious

Action: Retracts corners of mouth (fake smile)

Zygomaticus Major

Action: Elevates and pulls corner of mouth laterally (big smile)

Zygomaticus Minor

Action: Elevates and protrudes upper lip (smile or grimace)

Levator Labii Superioris Alaeque Nasi

Action: Flare nostrils; assist to elevate upper lip

Nasalis- Alar fibers

Action: Flares nostrils

Nasalis- Transverse fibers

Action: Constricts nostrils

Procerus

Action: Pulls eyebrows down

Orbicularis Oculi

Action: Closes eyelids

Occipitofrontalis

Action: Elevates one or both eyebrows

Masseter

Bilaterally: elevates & protracts mandible (very strong)

Temporalis

Bilaterally: elevates and retracts

Medial Pterygoid

Action: Bilaterally- Elevates and protracts mandible

Lateral Pterygoid

Action: Bilaterally- depresses and protracts mandible