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frontal belly
raises the eyebrows, wrinkles forehead
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orbicularis oculi
closes eyes (blinking, squinting)
-
orbicularis oris
wraps around the lips, closes and purses them
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buccinator
compresses cheek (whistling)
-
corrugator supercilii
wrinkles skin of forehead vertically
-
zygomaticus
raises corners of mouth for smiling
-
platysma
tenses skin of neck
-
masseter
elevates and protracts mandible
-
temporalis
elevates and retracts mandible
-
sternocleidomastoid
flexion of head when both sides are contracted, rotates head to opposite shoulder when only one side is contracted
-
splenius capitis
extends nd hyperextends head
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erector spinae
extends vertebral column
-
intercostals
elevates rib cage during inspiration (inhalation)
-
internal intercostals
depresses rib cage during forced exhalation
-
diaphragm
prime mover of inspiration (inhalation), increases vertical dimensions of thorax
-
external oblique
compresses abdominal wall, trunk rotation and lateral flexion
-
internal oblique
compresses abdominal wall, trunk rotation and lateral flexion
-
rectus abdominis
flexes vertebral column (6pack)
-
pectoralis minor
draws scapula forward and downward
-
serratus anterior
draws scapula forward (protracts)
-
trapezius
elevates and retracts scapula
-
major
flexes, adducts, and medially rotates arm
-
latissimus dorsi
extends and adducts arm
-
deltoid
abducts, flexes and extends arm
-
subscapularis
rotates arm medially (at shoulder joint)
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