Elbow and Forearm Joint Muscles

Biceps brachii O&I

Biceps brachii O&I

O: Long head - supraglenoid tubercle

O: Short head - coracoid process and upper lip of glenoid fossa

I: Radial tuberosity

Biceps brachii action

elbow flexion

forearm supination

shoulder flexion

shoulder abduction

Brachialis O&I

O: distal ½ anterior shaft of humerus

I: coronoid process of ulna

Brachialis action

elbow flexion

Brachioradialis O&I

O: lateral condyloid ridge

I: lateral distal end of styloid process of radius

Brachioradialis action

elbow flexion

pronation

supination

Triceps brachii O&I

O: Long head - infraglenoid tubercle

O: Lateral head - upper ½ posterior surface of humerus

O: Medial head - distal 2/3 posterior surface of humerus

I: olecranon process of ulna

Triceps brachii action

All heads

elbow extension

Long head

shoulder extension

shoulder adduction

shoulder horizontal abduction

Anconeus O&I

O: posterior surface of lateral condyle

I: posterior surface of upper ulna and olecranon process

Anconeus action

elbow extension

Pronator Teres O&I

O: distal part of medial condyloid ridge & upper side of proximal ulna

I: middle 1/3 lateral surface of radius

Pronator Teres action

pronation

elbow flexion

Pronator Quadratus O&I

O: distal ¼ anterior side of ulna

I: distal ¼ anterior side of radius

Pronator Quadratus action

pronation

Supinator O&I

O: lateral epicondyle of humerus & neighboring posterior part of ulna

I: lateral surface of proximal radius below head

Supinator action

supination

Elbow flexors (4)

Biceps Brachii

Brachialis

Brachioradialis

Pronator Teres

Elbow extenders (2)

Triceps Brachii

Anconeus

Forearm Supinators (3)

Biceps Brachii

Brachioradialis

Supinator

Forearm Pronators (3)

Brachioradialis

Pronator Teres

Pronator Quadratus