[TA] the triangular area in the lower abdominal wall bounded inferiorly by the inguinal ligament (externally) or iliopubic tract (internally), the border of the rectus abdominis medially and the inferior epigastric vessels (lateral umbilical fold) laterally. It is the site of direct inguinal hernia. SYN: trigonum inguinale [TA], Hesselbach triangle, inguinal trigone.
