[TA] head of origin of a muscle that is transversely situated. Terminologia Anatomica lists transverse heads (caput transversum ...) of the following: 1) adductor hallucis [TA] (... musculi adductoris hallucis [TA]); and 2) adductor pollicis [TA] (... musculi adductoris pollicis [TA]). SYN: caput transversum [TA].