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A&P1 - Muscles

The Muscles & Their Action

TermDefinition
abductor pollis longus abducts at point of thumb and wrist
adductor longus adduction, flexion and medial rotation at hip
adductor magnus adduction at hip
biceps brachii flexion at elbow and shoulder
biceps femoris flexion at knee
brachialis flexion at elbow
briachioradialis flexion at elbow
buccinator compresses cheeks
coracobrachialis adduction and flexion at shoulder
deltoid whole muscle; abduction at shoulder
depressor labii inferioris elevates upper lip
erector sipnae extends neck
extensor carpi radialis breris extension and abduction at wrist
extensor carpi radialis longus extension and abduction at wrist
extensor carpi ulnaris extension and adduction at wrist
extensor digitorum extension of fingers at joints 2-5
extensor digitorum longus extension of joints of toes 2-5
extensor hallucis longus extension at joints of great toe
extensor pollicis brevis extension at joints of thumb; abduction at wrist
external abdominal oblique compresses abdomen, depresses ribs and flexes or binds spine
external intercostalis elevates ribs
fibularis brevis extension of foot and extension at ankle
fibularis longus eversion of foot and extension at ankle; supports longitudinal arch
flexor carpi radialis flexion and abduction at wrist
flexor carpi ulnaris flexion and abduction at wrist
flexor digitorum longus flexion at joints of toes 2-5
flexor digitorum profundis flexion at distal interphalangeal joints and to a lesser degree, promixal interphalangeal joints and wrist
flexor digitorum superficialis flexion at proximal interphalangeal, metacarpophalangeal and wrist joints
flexor hallucis longus flexion at joints of great toe
flexor pollicus longus extension at joints of thumb, abduction at wrist
gastrochemius extension at ankle, inversion of foot, and flexion at knee
gluteus maximus extension and lateral rotation at hip
gluteus medius abduction and medial rotation at hip
gracilis flexion at knee, adduction and medial rotation at hip
iliopsoas flexion at hip
infraspinatus lateral rotation at shoulder
internal abdominal oblique compresses abdomen, depresses ribs and flexes or bends spine
latissimus dorsi extension, adduction, and medial rotation at shoulder
levator labii superioris elevates upper lip
levator scapulae elevates scapula
masseter elevates mandible and closes the jaw
nasalis compresses bridge, depresses tip of nose and elevates corners of nostrils
occipitofrontalis raises eyebrows, wrinkles forehead and tenses/retracts scalp
orbicularis occuli closes eye
orbicularis oris compresses, purses lips
palmaris longus flexion at wrist
pectoralis minor depresses and protracts shoulder
pectoralis major flexion, adduction, and medial rotation at shoulder
popliteus medial rotation of tibia; flexion at knee
pronator teres pronation
rectus abdominus depresses ribs, flexes vertebral column, compresses abdomen
rectus femoris extension at knee; flexion at hip
rhomboideus major adducts scapula and performs downward rotation
rhomboideus minor adducts scapula and performs downward rotation
rhisoris draws corner of mouth to side
sartorius flexion at knee, flexion and lateral rotation at hip
semitendinosus flexion at knee; extension and medial rotation at hip
serratus anterior protracts shoulder; rotates scapula
soleus extension at ankle
sternocleidomastoid together, they flex the neck; alone, one side
subscapularis medial rotation at shoulder
supinator supination
supraspinatus abduction at the shoulder
temporalis elevates mandible
tensor fasciae latae flexion and medial rotation at shoulder
teres major extension, adduction, and medial rotation at shoulder
teres minor lateral rotation at shoulder
tibialis anterior flexion at ankle; inversion of foot
trapezius depends on active region and state of other muscles; may (1) elevate/retract/depress or rotate scapula upward (2) elevate clavicle or (3) extend neck
transversus abdominis compresses abdomen
triceps brachii extension at elbow
vastus intermedius extension at knee
vastus lateralis extension at knee
vastus medialis extension at knee
zygomaticus major retracts and elevates corner of mouth
zygomaticus minor retracts and elevates upper lip
Created by: jnipper
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