The triceps brachialis muscle
The triceps brachial muscle , m. Triceps
Brachii
, Large, long, is located along the entire posterior surface of the shoulder, from the scapula to the ulnar process.

The muscle has three heads: long, lateral and medial. Above, at the place of its origin, the heads are covered with m. Deltoideus. Long head, caput Longum . Begins as a broad tendon from the subarticular tubercle of the scapula, is directed downward, passing in the space between m. Teres minor and m. Teres major, and lies beside and inside of the outer head.

Lateral head, caput Lateralis , originates from the posterior surface of the humerus, above the furrow of the radial nerve, and from the medial and lateral intermuscular septum of the shoulder. The muscle beams of the lateral head are directed towards the inside and down.
Medial head, caput Mediale , covered with lateral and partly long heads. It begins from the posterior surface of the humerus, below the radial nerve groove, and from the medial and lateral intermuscular septum of the shoulder.
All three heads converge, forming a spindle-shaped, powerful abdomen, which at the bottom passes into a strong tendon that attaches to the elbow process. A number of deep beams of the medial head are intertwined in the joint capsule of the elbow joint.

In the thickness of the tendon sometimes lies the elbow inside the bag, bursa Intra - tendinea Olecrani . In addition, in this area there are two more bags. One is a small subclavial bag of the triceps brachii muscle, bursa Subtendinea M. Trenchitis Brachii , is located directly between the humerus and the inner surface of the tendon of the triceps brachii muscle; The second - a large ulnar subcutaneous bag, bursa Subcutanea Olecrani , lies between the back surface of the ulnar process and the skin itself.
Function: due to the long head, the hand moves backwards and brings the shoulder to the trunk; The whole muscle takes part in the extension of the forearm.
Innervation: n. Radialis (C5-C8).
Blood supply: aa. Circumflexa humeri posterior, profunda brachii, collateralis ulnares superior et inferior.
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