Triceps Brachii

Joe Muscolino

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Superficial and deep posterior views of the triceps brachii. The triceps brachii has three heads: long, medial, and lateral.

The Triceps Brachii is composed of three heads: Lateral, Medial, and Long.


  • The triceps brachii attaches from the infraglenoid tubercle of the scapula (long head) and the posterior shaft of the humerus (lateral and medial heads) to the olecranon process of the ulna.





  1. The medial head of the triceps brachii is sometimes referred to as the deep head.
  2. Only the long head of the triceps brachii crosses the shoulder / glenohumeral joint.