Upper Extremity Muscles

Deltoid

curve of shoulder formed by large deltoid muscle

• Infraspinatus

Laterally rotates shoulder; stabilizes the head of the humerus in glenoid cavity; one of the "rotator cuff" muscles

• Supraspinatus

Abducts arm; stabilizes the head of the humerus in glenoid cavity; one of the "rotator cuff" muscles

• Subscapularis

medial rotation at shoulder

• Teres major

extends, adducts, and medially rotates arm

• Teres minor

lateral rotation at shoulder

• Biceps brachii

Flexes and supinates forearm

• Brachialis

flexes elbow

• Triceps brachii

extends forearm at elbow

• Coracobrachialis

Flexes and adducts the humerus

• Pronator teres

pronation of forearm

• Flexor carpi radialis

flexes and abducts wrist

• Palmaris longus

flexion of wrist

• Flexor carpi ulnaris

flexes wrist and adducts hand

• Brachioradialis

flexes forearm at elbow

• Extensor carpi radialis longus

Extends wrist and abducts hand

• Extensor carpi radialis brevis

a short, superficial muscle in the posterior compartment of the forearm that acts as a primary wrist extensor

• Extensor digitorum

Extends fingers and the wrist

• Extensor digiti minimi

extends little finger

• Extensor carpi ulnaris

extends wrist and adducts hand

• Anconeus

extension of elbow

• Abductor pollicis longus

abducts and extends thumb

• Extensor pollicis brevis

extends thumb