The posterior humeral circumflex artery arises from the third part of the axillary artery at the distal border of the subscapularis.
Posterior humeral circumflex artery
Triceps
Videos
The triceps, or triceps brachii, is a large muscle on the back of the upper limb of many vertebrates. It consists of three parts: the medial, lateral, and long head. All three heads cross the elbow jo
Right-sided triceps brachii seen from behind. (After Testut's Anatony.)
Drawing of the right-sided triceps brachii, depicting its three heads; posterior view. 1, Lateral head. — 2, Long or scapular head. — 3, Medial or short head. — 4, Olecranon (ulna). — 5, Radius. — 6, Capsular ligament of the shoulder joint. (After Hughes.)
Horizontal section of upper arm. Triceps muscle is shown in green text