Pelvic brim

Definition

The pelvic brim is an anatomical structure that separates the false pelvis (above) from the true pelvis (below), forming a boundary between the two. It is a bony edge created by parts of the hip bones and the sacrum.

Related terms

False Pelvis:

The upper portion of the pelvic cavity located above the pelvic brim, providing support for some abdominal organs.

True Pelvis:

The lower portion of the pelvic cavity below the pelvic brim, encompassing the pelvic inlet, cavity, and outlet which play crucial roles during childbirth.

Sacrum:

A triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, forming part of the spine and contributing to the structure of the pelvic brim