Inferior pubic ramus

Its anterior surface is rough, for the origin of muscles—the Gracilis along its medial border, a portion of the Obturator externus where it enters into the formation of the obturator foramen, and between these two, the Adductores brevis and magnus, the former being the more medial.

The posterior surface is smooth, and gives origin to the Obturator internus, and, close to the medial margin, to the Constrictor urethrae.

In the female pelvis, the medial border is thick, rough, and everted, and presents two ridges, separated by an intervening space. The ridges extend downwards, and are continuous with similar ridges on the inferior ramus of the ischium;

• to the external ridge is attached the fascia of Colles
• to the internal ridge is attached the inferior fascia of the urogenital diaphragm

The lateral border is thin and sharp, forms part of the circumference of the obturator foramen, and gives attachment to the obturator membrane.

• pubis (bone)

This article incorporates text in the public domain from page 237 of the 20th edition of Gray's Anatomy (1918)

• Cross section image: pelvis/pelvis-e12-15—Plastination Laboratory at the Medical University of Vienna
• pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (pelvislateral)