The pelvic cavity is a body cavity that is bounded by the bones of the pelvis and which primarily contains reproductive organs, the urinary bladder, and the rectum.
The boundaries are as follows:
Greater and lesser pelvis
The lesser pelvis (or "true" pelvis" only includes structures inferior to the pelvic brim.
For example, the pelvic splanchnic nerves arising at S2-S4 is in the true pelvis, but the femoral nerve from L2-L4 is only in the "false pelvis", or greater pelvis.
Articulations of pelvis. Anterior view.
The arteries of the pelvis.
Dissection of side wall of pelvis showing sacral and pudendal plexuses.
Sacral plexus of the right side.