human_reference_atlas has part cell of skeletal muscle Homo sapiens triceps brachii https://upload.wikimedia.org/wikipedia/commons/8/83/Triceps_brachii.png triceps brachii muscle Wikipedia:Triceps_brachii_muscle musculus triceps brachii VHOG:0000851 SCTID:181623009 MA:0002399 triceps EHDAA2:0002080 uberon The triceps brachii muscle (Latin for 'three-headed' muscle of the arm, it is called a three headed muscle because there are three bundles of muscle, each of different origin, joining together at the elbow) 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'. [WP,unvetted]. triceps muscle AS Dorsal group derivative that acts on the forearm[Kardong] triceps brachii muscle triceps brachii muscle NCIT:C90604 UMLS:C0559502 UBERON:0001509 EHDAA:8287 FMA:37688 EMAPA:19111 NCIT:C33812 skeletal muscle organ Muscle of posterior compartment of arm