Triceps brachii muscle
Triceps Brachii Muscle
The Triceps Brachii Muscle (pronounced: TRY-seps BRAY-key-eye) is a large muscle located at the back of the upper arm in humans. It is responsible for the extension of the elbow joint and forearm, as well as stabilizing the shoulder joint.
Etymology
The term "Triceps Brachii" is derived from Latin, with "triceps" meaning "three-headed" and "brachii" referring to the arm. This name is given due to the muscle's three-headed structure, which includes the long, lateral, and medial heads.
Structure
The Triceps Brachii Muscle consists of three parts:
- Long Head: Originates from the infraglenoid tubercle of the scapula.
- Lateral Head: Originates from the posterior surface of the humerus.
- Medial Head: Originates from the radial groove of the humerus.
These three heads converge to a single tendon to insert at the olecranon process of the ulna.
Function
The primary function of the Triceps Brachii Muscle is to facilitate the extension of the forearm at the elbow joint. It also plays a role in the adduction and extension of the arm at the shoulder joint.
Related Terms
- Elbow Joint: The joint connecting the upper arm and the forearm.
- Humerus: The bone of the upper arm or forelimb.
- Scapula: Also known as the shoulder blade.
- Ulna: One of the two long bones in the forearm.
See Also
External links
- Medical encyclopedia article on Triceps brachii muscle
- Wikipedia's article - Triceps brachii muscle
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