KIN 312- Muscles acting on the forearm

Biceps Brachii m. (Long Head)

Action: Flexion of the forearm at the humeroulnar j. ; Supination of the forearm and the proximal radioulnar j.

Proximal: supraglenoid tubercle of scapula b.

Distal: radial tuberosity and bicipital aponeurosis of the radius b.

Biceps Brachii m. (Short Head)

Action: Weakly flexes the forearm at the humeroulnar j.

P: Coracoid process of scapula b.

D: radial tuberosity and bicipital aponeurosis of the radius b.

Brachialis m.

Action: flexion of the forearm at the humeroulnar j.

P: distal anterior surface of the humerus b.

D: tuberosity and coronoid process of the ulna b.

Brachioradialis m

Action: flexion of the forearm at the humeroulnar j.

P: lateral supracondylar ridge of the humerus b.

D: styloid process of radius b.

Triceps Brachii m (Long head)

Action: Extension of the forearm at the humeroulnar j. ; extension and adduction of the arm at the glenohumeral j.

P: infraglenoid tubercle of scapula b.

D: olecranon of ulna b.

Triceps Brachii m (lateral head)

Action: Extension of the forearm at the humeroulnar j.

P: posteriorly of the humerus b. proximal radial groove

D: olecranon of the ulna b.

Triceps Brachii m (medial head)

Action: extension of forearm at the humeroulnar j.

P: posterior of the humerus b. distal to radial groove

D: olecranon of ulna b.

Anconeus m.

Action: extension of forearm at the humeroulnar j.

P: lateral epicondyle of humerus b

D: olecranon of ulna b.

Pronator teres m

Action: pronation of the forearm at the proximal radioulnar j.

P: medial epicondyle of humerus b. ; coronoid process of ulna b.

D: lateral surface of radius b.

Pronator Quadratus m.

Action: pronation of the forearm at the distal radioulnar j.

P: distal 4th of the ulna b.

D: distal 4th of the radius b.

Supinator m

Action: supination of the forearm at the proximal radioulnar j.

P: lateral epicondyle of humerus b. and ulna b. distal to radial notch

D: anterolateral surface of radius b. distal to radial tuberosity