Tricep Brachii
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Triceps is Latin phrase for 'three-headed', reflecting the three parts of this muscle. Brachii means 'of the arm'. Triceps brachii is often called the triceps (both singular and plural).
The triceps is an extensor muscle of the elbow joint, and is an antagonist of the biceps and brachialis muscles. It can also fixate the elbow joint when the forearm and hand are used for fine movements, eg when writing.
The triceps accounts for approximately 70 percent of the upper arm's muscle mass.
This article was originally based on an entry from a public domain edition of Gray's Anatomy.