The large muscle on the anterior surface of the upper arm is the biceps brachii. This muscle has two origins, thus its name "biceps". The function of the biceps brachii is to flex the foreleg. In the cat the pectoantebrachialis extends from the sternum across the pectoralis major and the biceps brachii to end on the ulna. The pectoantebrachialis has no homologue in humans as was discussed in chapter sixteen. Deep to the pectoantebrachialis is the brachialis.
The antagonist of the biceps brachii is located on the posterior surface. It is the triceps brachii. As you might suspect it has three origins.
The biceps brachii, brachialis, and triceps brachii are also found on the human arm.
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