pelvic outlet (fourth parallel pelvic plane, plane of outlet, inferior pelvic aperture)

Introduction

The lower opening of the pelvis.

Bounded by:

• inferior margin of the pubic symphysis anteriorly
• inferior pubic ramus & ischial tuberosity anterolaterally
• sacrotuberous ligaments posterolaterally
• tip of the coccyx posteriorly.

More general terms

• inlet (aditus)

Additional terms

• pelvic inlet (first parallel pelvic plane, pelvic brim, plane of inlet, superior pelvic aperture)