Forearm Muscle Terms & Definitions - Theater Study Set

Biceps Brachi

Origin: Scapula of shoulder girdle

Insertion: Proximal radius

Primary Action: Flexes elbow and supinates forearm

Brachialis

origin: distal portion of anterior humerus

insertion: coronoid process of ulna

action: flexor of forearm

Brachioradialis

Origin: Lateral ridge at distal end of humerus

Insertion: Base of radial styloid process

Action: Synergist in forearm flexion

Supinator

Origin: Lateral epicondyle of humerus

Insertion: Radius

Action: Supinates forearm

Pronator Teres

origin: medial epicondyle of humerus

insertion: radius

action: pronates forearm

Pronator Quadratus

origin: distal end of ulna

insertion: distal end of radius

action: pronates forearm and hand

Triceps Brachii

Origin: scapula and humerus

Insertion: ulna

Action: extends forearm