Muscle origin, insertion, action

Muscle

Description

Muscles of the Head: Facial Expression
Origin
Insertion

Action

bipartite muscle,
Epicranius:includes frontalis connected by galea
& occipitalis aponeurotica covers forehead, no bony attachments

galea aponeurotica

skin of eyebrows and root of raises eyebrows (as in surprise); nose wrinkles forehead skin horizontally

Occipitalis

back of head

occipital and temporal bones galea aponeurotica

pulls scalp posteriorly

Corrugator supercilii

small muscle, activity assoc. w/ obicularis oculi arch of frontal bone above nasal bone

skin of eyebrow

draws eyebrows together and inferiorly;wrinkles skin of forehead vertically (as in frowning)

Frontalis

protects eyes from intense light and injury; blinking, squinting & draws eyebrows inferiorly

Obicularis oculi

sphincter muscle of the frontal and maxillary bones eyelid and ligaments around orbit tissue of eyelid

Zygomaticus: major & minor muscle pair extending diagonally from cheekbone to corner of mouth zygomatic bone

skin and muscle at corner of raises lateral corners of mouth mouth upward (smiling muscle)

Risorius

inferior and leteral to zygomaticus skin at angle of mouth

lateral fascia assoc. w/masseter muscle

draws corner of lips laterally, tenses lips (synergist of zygomaticus)

Levator labii superioris

between obicularis oris zygomatic bone and opens lips; raises and furrows upper and inferior eye margin infraorbital margin of maxilla skin and muscle of upper lip lip

Depressor labii inferioris

running from mandible body of mandible lateral to to lower lip its midline

draws lower lip inferiorly (as in a skin and muscle of lower lip pout)

Depressor anguli oris

lateral to depressor labii inferioris

body of mandible below incisors skin and muscle at angle of mouth below insertion of zygomaticus Obicularis oris

multi-layered muscle, most fibers run