Pelvic inlet

Definition

The pelvic inlet is the upper opening of the true pelvis bounded by the rim of the pelvic bone. It separates the pelvic cavity above from the perineal area below and plays a crucial role in childbirth.

Related terms

Pelvic Girdle: The pelvis is made up of several bones that connect the trunk and legs, functioning as a support for lower body movement.

Sacrum:

A large, triangular bone at the base of the spine and at the upper, back part of the pelvic cavity, which helps form part of the structure surrounding the pelvic inlet.

Obstetric Conjugate: The shortest distance between the sacral promontory and approximately midway between symphysis pubis and its superior margin; it's a measurement used to assess pelvic inlet size for childbirth readiness