anatomy: facial exp moina

levator palpebrae superiosis

elevates the upper eyelid

buccinator

compresses cheeks

corrugator supercilii

draws eyebrows downward and medially (thinkers brow)

depressor anguli oris

depresses angles of mouth (frown)

depressor labii inferiosis

draws lower lip downward and laterally; everts lower lip

depressor septi nasi

constricts nostrils

frontalis

draws scalp posteriorly to raise eyebrows and wrinkle brow (surprise)

levator anguli oris

elevates angles of mouth

levator labii superiosis and zygomaticus minor

elevates and everts upper lip

levator labii superiosis alaeque nasi

elevates and everts upper lip; flares nostrils

mentalis

elevation of lower lip; everts lower lip; wrinkles skin of chin

nasalis

flares nostrils (particularly in forced respiration)

occipitalis

draws back scalp to raise eyebrows and wrinkle brow (surprise)

orbicularis oculi

closes eyes tightly; squinting of eyes; depresses upper eyelid; elevates lower eyelid (palpebral part)

orbicularis oris

closes mouth; protruding lips

platysma

tenses skin over lower neck (creates a ridge in skin); depress mandible and lower lip

procerus

draws medial eyebrow downward (menacing expression); wrinkles skin of superior nose

risorius

draws angle of mouth laterally (fake smile)

zygomaticus major

elevates angle of mouth (smiling); pulls angle of mouth laterally

masseter and medial/internal pterygoid

closes (elevates) the jaw

temporalis

anterior fibers: closes jaw; middle + posterior fibers: retract mandible

lateral/external pterygoid

protrusion of the jaw