Which biological structure is not found in the true pelvis?

Femoral nerve-to answer this question, you need to understand what the true pelvis is. the true pelvis is the area beneath the pelvic brim (pelvic inlet), where the pelvic viscera are located. the false pelvis is the area above the pelvic brim, bounded by the iliac blades. now, you just need to think about the structures listed and determine which ones are in which location. the femoral nerve is the structure that is not in the true pelvis. after coming off the lumbar plexus with contributions from l2, 3, and 4, the femoral nerve runs along the border between the psoas major muscle and the iliacus to travel into the lower limb. it never descends below the pelvic brim, so it is not in the true pelvis. hypogastric nerves connect the superior and inferior hypogastric plexuses. since the inferior hypogastric plexus is lying between the pelvic viscera and the pelvis wall, in the true pelvis, the hypogastric nerves should also be in the true pelvis. the internal pudendal artery is a branch of the anterior division of the internal iliac artery. it lies in the true pelvis and supplies blood to the perineum. the obturator artery is a branch of the anterior internal iliac artery or, if it is the aberrant obturator, the inferior epigastric artery. it is in the true pelvis, and exits the pelvis through the obturator foramen. the pelvic splanchnic nerves represent the sacral portion of the craniosacral outflow (parasympathetic) of the autonomic nervous system. they come from the ventral rami of the second, third, and fourth sacral nerves. so, that puts them in the true pelvis, too.