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Muscles of the Head & Trunk
muscle name and action
31
Anatomy
Undergraduate 1
10/31/2013

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Cards

Term
Occipitofrontalis - frontal belly
Definition
raises eyebrow,
wrinkles forehead
Term
Occipitofrontalis - occipital belly
Definition
tenses & retracts scalp
Term
Orbicularis Oculi
Definition
close eye
Term
Zygomaticus Major
Definition
retracts and elevates upper lip
Term
Risorius
Definition
Draws corner of mouth to side
Term
Levator Labii Superioris
Definition
elevates upper lip
Term
Depressor Labii Inferioris
Definition
depresses lower lip
Term
Depressor Anguli Oris
Definition
depresses corner of mouth
Term
Orbicularis Oris
Definition
compresses, purses lips
Term
Mentalis
Definition
elevates and protrudes lower lip
Term
Buccinator
Definition
Compresses cheeks
Term
Masseter
Definition
elevates mandible,
closes the jaw
Term
Temporalis
Definition
elevates mandible
Term
Digastric
Definition
depresses mandible or elevates larynx
Term
Mylohyoid
Definition
elevates hyoid bone or
depresses mandible
Term
Sternocleidomastoid
Definition
flexes the neck;
one alone bends the head toward shoulder & rotates neck
Term
Scalenes
Definition
(3-left side of neck)
elevate ribs or flex neck
Term
Erector Spinae Group
Definition
extends spine
Term
Trapezius
Definition
-elevate clavicle
-extend neck
Term
Latissimus Dorsi
Definition
extend, abduct, and rotate the arm
Term
Levator Scapulae
Definition
elevates scapula
Term
Rhomboideus Major
Definition
abducts scapula and performs downward rotation
Term
Rhomboideus Minor
Definition
abducts scapula and performs downward rotation
Term
Pectoralis Major
Definition
flexion, abduction, and medial rotation @ shoulder
Term
Pectoralis Minor
Definition
Depresses and protracts shoulder;
rotates scapula (downward rotation)
elevates ribs if scapula is stationary
Term
External Intercostal
Definition
Depresses ribs
Term
Diaphragm
Definition
contraction and relaxation for breathing
Term
Rectus Abdominus
Definition
flexion of the trunk
Term
External Abdominal Oblique
Definition
pull chest downwards
compress abdominal cavity
Term
Internal Abdominal Olique
Definition
supports abdominal wall
assists in forced breathing
rotates and abducts the truck
Term
Transverse Abdominus
Definition
compress ribs
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