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Muscle O, I, and A's
origin, insertion, and actions of muscles
69
Anatomy
Undergraduate 3
11/27/2008

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Cards

Term

Frontal Belly

Origin

Definition
galea
Term

Frontal Belly

 

Insertion

Definition
skin of eyebrows and root of nose
Term

frontal belly

 

action

Definition
raises eyebrows; wrinkles forehead skin horiz.
Term

occipital belly

 

origin

Definition
occipital and temporal bones
Term

occipital belly

 

insertion

Definition

galea aponeurotica

Term

occipital belly

 

action

Definition
fixes aponeurosis and pulls scalp posteriorly
Term

corrugator supercilli

 

origin

Definition
arch of frontal bone above nasal bone
Term

corrugator supercilli

 

insertion

Definition
skin of eyebrow
Term

corrugator supercilli

 

action

Definition

draws eyebrows together;

wrinkles forehead skin vertically

Term

orbicularis oculi

 

origin

Definition
frontal and maxillary bones and lig. around orbit
Term

orbicularis oculi

 

insertion

Definition
tissue of eyelid
Term

orbicularis oculi

 

action

Definition

blinking, squinting, and draws eyebrows inferiorly

Term

zygomaticus

 

origin

Definition
zygomatic bone
Term

zygomaticus

 

insertion

Definition
skin and muscle at corner of mouth
Term

zygomaticus

 

action

Definition
raises lat. corners of mouth upward
Term

Risorius

 

origin

Definition
lat. fascia of masseter muscle
Term

Risorius

 

insertion

Definition
skin at angle of mouth
Term

Risorius

 

action

Definition

draws corner of lip laterally;

tenses lips

Term

Levator labii superioris

 

origin

Definition
zygomatic bone and infraorbital margin of maxilla
Term

Levator labii superioris

 

insertion

Definition
skin and muscle of upper lip
Term

levator labii superioris

 

action

Definition

opens lip;

raises and furrows upper lip

Term

depressor labii inferioris

 

origin

Definition
body of mandible lat. to its midline
Term

Depressor labii inferioris

 

insertion

Definition
skin and musc. of lower lip
Term

depressor labii inferioris

 

action

Definition
draws lower lip inferiorly
Term

depressor anguli oris

 

origin

Definition
body of mandible below incisors
Term

depressor anguli oris

 

insertion

Definition

skin and musc. at angle of mouth below insertion

of zygomaticus

Term

depressor anguli oris

 

action

Definition
draws corners of mouth downward and laterally
Term

orbicularis oris

 

origin

Definition

arises indirectly from maxilla and mandible;

fiber blend with other facial musc. of lips

Term

orbicularis oris

 

insertion

Definition

muscle and skin at angles of mouth

Term

orbicularis oris

 

action

Definition
lips; kissing and whistling muscle
Term

Mentalis

 

origin

Definition
mandible below incisors
Term

mentalis

 

insertion

Definition
skin of chin
Term

mentalis

 

action

Definition

protrudes lower lip;

wrinkles chin

Term

 Buccinator

 

origin

Definition
molar region of maxilla and mandible
Term

Buccinator

 

insertion

Definition
orbicularis oris
Term

Buccinator

 

action

Definition

draws corner of mouth laterally;

compresses cheek

Term

Platysma

 

origin

Definition
fascia of chest
Term

Platysma

 

insertion

Definition

lower margin of mandible, and

skin and muscle at corner of mouth

Term

Platysma

 

action

Definition

helps dress mandible;

pulls lower lip back and down;

tenses skin of neck

Term

Masseter

 

origin

Definition
zygomatic arch and maxilla
Term

Masseter

 

 insertion

Definition
angle and ramus of mandible
Term

Masseter

 

action

Definition

elevates mandible

Term

Temporalis

 

origin

Definition
temporal fossa
Term

Temporalis

 

insertion

Definition
coronoid process of mandible
Term

Temporalis

 

action

Definition

closes jaw;

elevates and retracts mandible

Term

Medial Pterygoid

 

origin

Definition
medial surface of lat. pterygoid plate
Term

Medial Pterygoid

 

insertion

Definition
medial surface of mandible near its angle
Term

Medial Pterygoid

 

action

Definition

elevates mandible;

protrudes mandible and side-side mvts.

Term

Lateral Pterygoid

 

origin

Definition
greater wing and lat. pterygoid plate
Term

Lateral Pterygoid

 

insertion

Definition

condyle of mandible and capsule of

tempromandibular joint

Term

Lateral Pterygoid

 

action

Definition

protrudes mandible;

helps with side-to-side grinding mvts.

Term

Genioglossus

 

origin

Definition
internal surface of mandible near symphysis
Term

Genioglossus

 

insertion

Definition

inferior aspect of tongue and

body of hyoid bone

Term

Genioglossus

 

action

Definition

primarily protrudes tongue, but can

depress or retract tongue

Term

Hypoglossus

 

origin

Definition
body of greater horn of hyoid bone
Term

Hypoglossus

 

insertion

Definition
inferolateral tongue
Term

Hypoglossus

 

action

Definition

depresses tongue and draws its sides

downward

Term

Styloglossus

 

origin

Definition
styloid process of temporal bone
Term

Styloglossus

 

insertion

Definition
inferolateral tongue
Term

Styloglossus

 

action

Definition
retracts and elevates tongue
Term

Digastric

 

origin

Definition

lower margin of mandible,

mastoid process of temporal bone

Term

Digastric

 

insertion

Definition

hyoid bone

Term

Digastric

 

action

Definition

elevate hyoid bone;

open mouth and depress mandible

Term

Stylohyoid

 

origin

Definition
styloid process of temporal bone
Term

Stylohyoid

 

insertion

Definition
hyoid bone
Term

Stylohyoid

 

origin

Definition
elevates and retracts hyoid
Term

Mylohyoid

 

origin

Definition
medial surface of mandible
Term

Mylohyoid

 

insertion

Definition
hyoid bone and median raphe
Term

Mylohyoid

 

action

Definition
elevates hyoid bone and floor of mouth
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