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( Triceps brachii muscle)
The triceps brachii (Latin for "three-headed" [muscle] of the arm) is the large muscle on the back of the human upper limb. It is the muscle principally responsible for extension of the elbow joint (i.e. straightening of the arm). Though a similarly-named muscle, the triceps surae, is found on the lower leg, the triceps brachii is commonly called simply the "triceps". The proper plural form of the adjective triceps is tricipes, a form not in general use; instead, triceps is used in both singular and plural (i.e., when referring to both arms). The form tricep [sic], though common even in professional contexts, is incorrect. The error may derive from a mistaken belief that triceps is a plural noun (rather than a singular adjective), since English typically forms its plurals with the addition of the letter s to the end of a word stem. The three heads have the following names and origins
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