Inferior pubic ramus

Inferior pubic ramus
Right hip bone. External surface. (Inferior ramus of pubis labeled at bottom right.)
Pelvis. Inferior ramus is 4c.
Details
Identifiers
Latin	Ramus inferior ossis pubis
Anatomical terms of bone

The inferior pubic ramus is a part of the pelvis and is thin and flat. It passes laterally and downward from the medial end of the superior ramus; it becomes narrower as it descends and joins with the inferior ramus of the ischium below the obturator foramen.

Surfaces

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.

Borders

The medial border is thick, rough, and everted, especially in females. It presents two ridges, separated by an intervening space.

The ridges extend downward, and are continuous with similar ridges on the inferior ramus of the ischium;

• to the external is attached the fascia of Colles.
• to the internal 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.

See also

• pubis (bone)

References

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

External links

• Template:EMedicineDictionary
• 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)