Origin: long head: infraglenoid tubercle of scapula; lateral head: posterior shaft of humerus; medial head: posterior humeral shaft distal to radial groove
Insertion: by common tendon into the olecranon process of ulna
Action: POWERFUL FOREARM EXTENSOR
Anconeus
Origin: lateral epicondyle of humerus
Insertion: lateral aspect of olecranon process of ulna
Action: controls ulnar abduction during forarm pronation
Bicep Brachii
Origin: short hea: coracoid process; long head: supragelnoid cavity; tendon of long head runs within capsule and into intertubercular sulcus of humerus
Insertion: by common tendon into radial tuberosity
ACTION: flexes elbow joint and supinates forearm
Brachialis
origin: front of distal humerus; embraces insertion of deltoid muscle
insertion: coronoid process of ulna and capsule of elbow joint
action: MAJOR FOREARM FLEXOR
Brachioradialis
Origin: lateral supracondylar ridge at distal end of humerus