Brachial plexus and its relation to axillary vessels.

Anteromedial view of anomalous division of the brachial artery.

Deep layers of anterior forearm muscles.

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.

Division of the triceps brachii to expose the coarse of the radial nerve.

Superior view of the socket for head of radius and trochlea of humerus.

Left (palmar view) and right (dorsal view) of the distribution of cutaneous nerves to palm and dorsum of hand (yellow, ulnar nerve; purple, median nerve; pink, radial nerve).

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.

Observe that three nerves (musculocutaneous, median, and ulnar) are arranged like limbs of an upper case M. Also observe anterior divisions (AD) and posterior divisions (PD).

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

Left arm shown from elbow down in gauntlet or thumb cast. Radial styloid and ulnar styloid illustrated upon cast to show possible pressure area of cast.

Dorsal view of tendons on the dorsum of hand and extensor retinaculum.

Arteries, ulnar and radial