[TA] the head of origin closest to the midline. Terminologia Anatomica lists medial head (caput mediale) of the following: 1) triceps brachii [TA] (... musculi tricipitis brachii [TA]); 2) gastrocnemius [TA] (... musculi gastrocnemii [TA]); and 3) flexor hallucis brevis [TA] (... musculi flexoris hallucis brevis [TA]). SYN: caput mediale [TA].