Anatomy Of Human

TRICEPS BRACHII MUSCLE

The triceps brachii muscle (Latin for "three-headed arm muscle") is the large muscle on the back of the upper limb of many vertebrates. It is the muscle principally responsible for extension of the elbow joint (straightening of the arm).

It is sometimes called a three-headed muscle because there are three bundles of muscles, each of different origins, joining together at the elbow. Though a similarly named muscle, the triceps surae, is found on the lower leg, the triceps brachii is commonly called the triceps.

The triceps run along the humerus between the shoulder and the elbow. Along with the biceps, it allows for extension and retraction of the forearm. When the triceps are tensed, the forearm extends and the elbow straightens; if the triceps are relaxed and the biceps tensed, the forearm retracts and the elbow bends. The triceps also serve to stabilize the shoulder joint at the top of the humerus; this is a key role as the shoulder is a relatively unstable joint. The bottom of the triceps are also involved in retracting the capsule of the elbow joint when the forearm extends, thereby allowing the elbow joint to be straightened successfully.



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