subinguinal triangle

fem·o·ral tri·an·gle

[TA]
a triangular space at the upper part of the thigh, bounded by the sartorius and adductor longus muscles and the inguinal ligament, with a floor formed laterally by the iliopsoas muscle and medially by the pectineus muscle; the branches of the femoral nerve are distributed within the femoral triangle; it is bisected by the femoral vessels, which enter the adductor canal at the triangles apex.

subinguinal triangle

(1) Saphenous hiatus; hiatus saphenus [NA6]. 
(2) Femoral triangle; trigonum femorale [NA6].