Muscle origin, insertion, action

Topics: Scapula, Pelvis, Muscles of the upper limb Pages: 0 (3693 words) Published: September 6, 2014
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...
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