The triceps brachii muscle is composed of three bundles of muscle, each of different origin, which converge in one tendon that inserts into the olecranon process of the ulna.
The external bundle originates in the posterior external part of the humerus. The long head of the tripceps branchii originates in the infraglenoid tubercle of the scapula, and the internal part in the posterior internal lateral of the humerus.
The triceps is an extensor muscle of the elbow joint, and is an antagonist of the biceps muscles.
Electro stimulation of the muscle can prove very useful for sports where high intensity extension of the arm is required, for example, in sports involving throwing or hitting like volleyball or Javelin throw. For any sport requiring intensive force in the arms, shoulder and elbow, working on this muscle is a must.