Muscles of the Arm Muscle Innervation Origin Insertion Action Nerve Root 1 Coracobrachialis Musculocutaneous Coracoid mid.humerus medial Flexion, adduction C5,6,7 lat cord 2 Biceps Musculocutaneous Coracoid(SH), Supraglenoid (LH) Radial tuberosity Supination, flexion C5,6 lat cord 3 Brachialis Musculocutaneous-medial, radial lateral Ant. Humerus Ulnar tuberosity (ant) Flexes forearm C5,6 lat/post cord 4 Triceps Radial Infraglenoid(LH), Post.Humerus(lat H.), Post. Humerus (MH) Olecranon Extends forearm C6,7,8,T1 post cord Nerves of the Arm Median nerve Radial nerve Ulnar nerve Musculocutaneous nerve Lateral antebrachial cutaneous nerve Lateral Brachial cutaneous nerve: Branch of radial nerve. Arteries and Veins of the Arm Cephalic vein Brachial artery and veins
