Biceps brachii

long head

O- supraglenoid tubercle above superior lip of glenoid fossa

I- tuerosity of the radius bicipital aponeursis (lacertus fibrosis)

A- Supination of the forearm, flex of elbow, weak flex of shoulder, weak abd of shoulder

Biceps brachii

Short head

O-coracoid process of thescapula and upper lip ofglenoid fossa in conjunction w/ the proximal attachment of the coracobrachialis

I-tuberosity of the radius & bicipital aponeurosis(lacertis fibrosis)

A- Supination of the forearm, flex of elbow, weak flex of shoulder, weak abd of shoulder

Brachialis

O-Distal half of the anterior shaft of the humerus

I- coronoid process of the ulna

A- True flexion of the elbow

O-Distal two-thirds of the lateral condyloid (supracondylar) ridge of the humerus

I- Lateral surface of the distal end of the dadius at the styloid process

A- Flexion of the forarm, pronation of forearm from supanated position to neutral, supination of forearm form pronated position to neutral

Triceps brachii

Long head

O- Infraglenoid tubrercle below inferior lip of glenoid fossa of the scapula

I- Olecranaon process of the ulna

A- Ext of elbow, extension of shoulder, horiz abd of shoulder

Triceps brachii

lateral head

O- Upper half of the posterior surface of the humerus

I- Olecranon process of the ulna

A- Ext of the elbow

Triceps brachii

medial head

O- Distal two thirds of the posterior surface of the humerus

I- Olecranon process of the ulna

A- Ext of the elbow

O- Posterior surface of the lateral condyle of the humerus

I- Posterior surface of the lateral olecranonprocess and proximal on fourth of the ulna

A- Ext of the elbow

O- Distal part of the medial condyloid ridge of the humerus and medial side of the proximal ulna

I- Middle third of the lateral surfac of the radius

A-pronation of the forearm, weak flexion of the elbo

O- Distal fourth of the anterior side of the ulna

I- distal fourth of the anteroir side of the radius

A- Pronation of the forearm

O- lateral picaonyle of the humrus and neighboring posterior part of the ulna

I- Latera surface of the proximal radius just belo the head

A- Supination of the elbow