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