The biceps brachii is a two headed muscle on located in the upper arm region. “Brachii” usually denotes structures found in the upper extremities and “biceps” means that it is a two-headed muscle. On the cat, if you tease away the fascia you can separate these two heads. The one that runs directly to the elbow joint is the long head and the one toward the outside of the cat’s forearm is the lateral head of the biceps.
