part of part of adjacent to adjacent to conduit for ilium ischium sciatic nerve bone foramen pelvic girdle skeleton ilioischiadic foramen UBERON:0018326 Situated just caudal to the acetabulum, the foramen is bound dorsally by the illium and ventrally by the ischium. The foramen transmitts the ischiadic nerves and vessels (Baumel et al. 1993).