Muscles of the arm

Biceps brachii

Biceps brachii

Origin: coracoid process, tubercle above glenoid cavity. Insertion: radial tuberosity of radius. Action: feces forearm at elbow and rotates had laterally

Brachialis

Origin: anterior shaft of humerus. Insertion: coronoid process of ulna. Action: flexes forearm at elbow

Supinator

Origin: lateral epicondyle of humerus, crest of ulna. Insertion: lateral surface of radius. Action: rotates forearm laterally

Pronator teres

Origin: medial epicondyle of humerus, coronoid process of ulna. Insertion: lateral surface of radius. Action: rotates forearm medially

Brachioradialis

Origin: distal lateral end of humerus. Insertion: lateral surface of radius. Action: flex forearm at elbow

Flexor carpi radialis

Origin: medial epicondyle of humerus. Insertion: base of 2nd and 3rd metacarpals. Action: flex and abduct wrist

Palmaris longus

Origin: medial epicondyle of humerus. Insertion: fascia of the palm. Action: flexes wrist

Pronator Quadratus

Origin: anterior distal end of ulna. Insertion: anterior distal end of radius. Action: rotates forearm medially

Triceps brachii

Origin: tubercle below glenoid cavity, lateral and medial surfaces of humerus. Insertion: olecranon process of ulna. Action: extends forearm at elbow

Extensor carpi radialis longus

Origin: distal end of humerus. Insertion: base of 2nd metacarpal. Action: extends wrist on radial side, abducts wrist

Flexor carpi ulnaris

Origin: medial epicondyle of humerus and olecranon process. Insertion: carpal and metacarpal bones. Action: flex wrist and adduct wrist

Extensor carpi ulnaris

Origin: lateral epicondyle of humerus. Insertion: base of 5th metacarpal. Action: extend wrist and adduct wrist

Extensor carpi radialis brevis

Origin: lateral epicondyle of humerus. Insertion: base of 2nd and 3rd metacarpals. Action: extends wrist and abducts wrist.

Extensor digitorum

Origin: lateral epicondyle of humerus. Insertion: posterior surfaces of phalanges 2-5. Action: extend fingers