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Chapter 12

latissimus dorsi
prime mover of arm extension arm adductor, power stroke
pectoralis major
prime mover of arm flexion; adducts arm
prime mover of arm abduction; antagonist of pectoralis major and latissimus dorsi
adducts and flexes arm
teres major
extends, adducts, and medially rotates arm
rotator cuff
stabilizes shoulder joint
biceps brachii
flexes elbow joint and supinates forarm
flexes elbow joint ( prime mover)
flexes elbow joint
triceps brachii
extends elbow joint ( prime mover)
flexor carpi radialis
flexes and abducts hand at wrist; synergist of elbow flexion
palmaris longus
weak wrist flexor
flexor carpi ulnaris
flexes and adducts wrist
flexor digitorum superficialis
flexes wrist and middle phalanges of fingers 2-5
flexor pollicis longus
flexes joints of thumb; flexes wrist
extensor carpi radialis brevis
extends and abducts wrist
extensor carpi radialis longus
extends and abducts wrist
extensor digitorum
prime mover of finger extension extends wrist and abducts fingers
extensor carpi ulnaris
extends and adducts wrist
extensor pollicis brevis
extends joints of thumb; adducts wrist
extensor pollicis longus
extends joints of thumb adducts wrist
prime mover of hip flexion, flexes trunk on thigh
psoas major
prime mover of hip flexion; lateral flexion of vertebral column; posture
flexes and laterally rotates thigh ant hip joint, flexes knee, tailor's muscle
adducts and medially or laterally rotates thigh
gluteus maximus
prime mover of hip extension, laterally rotates thigh at hip joint, antagonist of iliopsoas
gluteus medius
abducts PM and medially rotates thigh at hip joint
gluteus minimus
abducts thigh medially rotates thigh at hip joint under medius
tensor fasciae latae
abducts and medially rotates thigh
prime mover of thigh extension and knee flexion, biceps femoris, semitendinosus, semimembranosus
quadriceps femoris
extends knee joint (prime mover) and flexes thigh at hip rectus femoris, vastus lateralis, vastus medialis, vastus intermedius
extensor digitorum longus
dorsiflexes foot; prime mover of toe extension
extensor hallicus longus
extends great toe, dorsiflexes foot
tibialis anterior
prime mover of dorsiflexion of foot; inverts foot
prime mover of plantar flexion of foot, flexes knee when foot dorsiflexes
prime mover of plantar flexion of foot
flexor digitorum longus
plantar flexes and inverts foot;flexes toes; helps foot grip ground
flexor hallucis longus
plantar flexes and inverts foot; flexes great toe; push off muscle durring walking
unlocks extended knee for knee flexion