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explains and describes the actions and movements of the muscles.

Pectoralis major

Prime mover of arm flexion, rotates arm medially, adducts arm.


Prime mover of arm abduction when all its fibers contract simultaneously.

Biceps Brachii

Flexes elbow and supinates forearm

Triceps Brachii

Extends elbow.


Elbow Flexion.


Synergist in forearm flexion stabilizes elbow during rapid flexion and extension.

Pronator Teres

Pronates forearm; weak flexor of elbow.

Flexor Carpi Radialis

Powerful flexor of the wrist; abducts hand; weak synergist of elbow flexion.

Palmaris Longus

Tenses skin and fascia of palm during hand movements; weak wrist flexor; weak synergist for elbow flexion.

Flexor Carpi Ulnaris

Powerful flexor of wrist; also adducts hand in concert with extensor capi ulnaris; stabilizes wrist during finger extension.

Flexor Digitorum Superficialis

Flexes wrist and middle phalanges of fingers 2-5; the important finger flexor when speed and flexion against resistance are required.

Flexor Pollicis Longus

Flexes distal phalanx of thumb.

Flexor Digitorum Profundus

Flexes distal interphalangeal joints; slow-acting flexor of any or all fingers; assists in flexing wrist.

Extensor Carpi Radialis Longus

Extends wrist in conjunction with the extensor capi ulnaris and abducts wrist in conjunction with the flexor carpi radialis.

Extensor Carpi Radialis Brevis

Extends and Abducts wrist; acts synergistically with extensor carpi radialis longus to steady wrist during finger flexion.

Extensor Digitorum

Prime mover of finger extension; extends wrist; can abduct fingers.

Extensor Carpi Ulnaris

Extends wrist in conjunction with the extensor carpi radialis and adducts wrist in conjunction with flexor carpi ulnaris.


Assists biceps brachii to forcibly supinate forearm; works alone in slow supination; antagonist of pronator muscle.

Abductor Pollicis Longus

abducts and extends thumb

Extensor Pollicis brevis/longus

extends thumb.

Latissimus Dorsi

Prime mover of arm extension; powerful arm adductor; medially rotates arm at shoulder.

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