Anterior view of the posterior and medial walls of the axilla with pectoralis minor muscle excised, lateral and medial cords retracted, and axillary vein removed.

Two compartments of the arm with contents. The three heads of triceps brachii occupy the posterior brachial compartment.

Surface anatomy of axilla and anterolateral aspect of trunk.

Transverse section through arm; insert image shows level of transverse section.

Posterior view of the dorsal scapular and subdeltoid regions of the arm.

Transverse section through elbow joint; image to the right shows level of section.

Posterior aspect of the elbow with the triceps reflected and showing the medial and lateral epicondyle, ulnar nerve, pos. ulnar recurrent artery, olecranon, flexor carpi ulnaris; brachioradialis, ext. carpi radialis longus, common ext. tendon, anconeus, t

Transverse MRI of arm at mid humerus: BB, biceps brachii; BV, brachial vessels/nerves; MT, medial head of triceps; BC, brachialis; T, deltoid tuberosity; H, humerus; D, deltoid; LAT, lateral head triceps; LT, long head triceps; LI, lateral intermuscular s

Anterior view of the posterior wall of axilla, musculocutaneous nerve and posterior cord; pectoralis major and minor muscle and the lateral and medial cords are reflected, and the arteries, veins, and median and ulnar nerves are removed.

Triceps brachii and anconeus