The triceps brachii is located on the posterior of the humerus and is the primary extensor of the arm.
The triceps brachii has three heads:
- The lateral head (green) arises from the posterior of the humerus near the shoulder.
- The medial head (yellow) arises from lower half of the posterior of the humerus.
- The long head (blue) arises from the scapula.
The three heads come together in a single tendon that inserts into the olecranon of the ulna.
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