A muscle having three heads; specif., the great extensor of the forearm, arising by three heads and inserted into the olecranon at the elbow.

The muscles on the outside and back of the upper arm. Its main function is to straighten the arm (extend the elbow).

Muscle of the posterior upper arm, opposite the biceps, that extends the elbow.

A muscle with three heads. Triceps are located on the back of the upper arm.