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Muscle Actions

Upper Extremety/ Lower Extremity

QuestionAnswer
biceps brachii flexes and supinates forearm at elbow joint; flexes arm at shoulder joint
coracobrachialis flexes and adducts arm at shoulder joint
deltoid abducts, flexes, extends, and rotates arm at shoulder joint
infraspinatus rotates arm laterally at shoulder joint
latissimus dorsi extends,adducts, and rotates arm medially at shoulder joint; draws arm downward and backward
pectoralis major adducts and rotates arm medially at shoulder joint; flexes and extends arm at shoulder joint
subscapularis rotates arm medially at shoulder joint
supraspinatus assists deltoid muscle in abducting arm at shoulder joint
teres major extends arm at shoulder joint; assists in adduction and rotation of arm medially at shoulder joint
teres minor rotates arm laterally and extends arm at shoulder joint
triceps brachii extends forearm at elbow joint; extends arm at shoulder joint
brachialis flexes forearm at elbow joint
brachioradialis flexes forearm at elbow joint
extensor carpi radialis longus extends and abducts hand at wrist joint
extensor carpi ulnaris extends and adducts hand at wrist joint
extensor digitorum extends hand at wrist joint; extends phalanges of each finger
flexor carpi radialis flexes and abducts hand at wrist joint
flexor carpi ulnaris flexes and adducts hand at wrist joint
flexor digitorum profundus flexes hand at wrist joint; flexes phalanges of each finger
flexor digitorum superficialis flexes hand at wrist joint; flexes phalanges of each finger
palmaris longus weakly flexes hand at wrist joint
pronator teres pronates forearm
supinator supinates forearm
adductor brevis adducts, medially rotates, and flexes hip
adductor longus adducts, rotates, and flexes thigh at hip joint
adductor magnus adducts, flexes, rotates and extends thigh at hip joint
biceps femoris (hamstring) flexes leg at knee joint; extends thigh at hip joint
gluteus maximus extends and rotates thigh laterally at hip joint; helps lock knee in extension
gluteus medius abducts and rotates thigh medially at hip joint
gluteus minimus abducts, medially rotates, and flexes the hip joint
gracilis adducts and medially rotates thigh at hip joint; flexes leg at knee joint
iliacus flexes and rotates thigh laterally at hip joint; flexes vertebral column
pectineus flexes and adducts thigh at hip joint
piriformis rotates thigh laterally and abducts it at hip joint
psoas major flexes and rotates thigh laterally at hip joint; flexes vertebral column
rectus femoris (quadriceps) extends leg at knee joint; flexes thigh at hip joint
sartorius weakly flexes leg at knee joint; flexes, abducts, and laterally rotates thigh at hip joint, thus crossing leg
semimembranosus (hamstring) flexes leg at knee joint; extends thigh at hip joint
tensor fasciae latae flexes and abducts thigh at hip joint
extensor digitorum longus dorsiflexes and everts foot; extends toes
fibularis longus (peroneus longus) plantar flexes and everts (pronates) foot
flexor digitorum longus plantar flexes foot; flexes toes
gastrocnemius plantar flexes foot; flexes leg at knee joint
soleus plantar flexes foot
tibialis anterior dorsiflexes and inverts (supinates) foot
tibialis posterior plantar flexes and inverts foot
vastus intermedius (quadriceps) extends leg at knee joint
vastus lateralis (quadriceps) extends leg at knee joint
vastus medialis (quadriceps) extends leg at knee joint
semitendinosus (hamstring) flexes leg at knee joint; extends thigh at hip joint
Created by: edwardmcbiggins