Bone: Inferior pubic ramus
Right hip bone. External surface. (Inferior ramus of pubis labeled at bottom right.)
Pelvis. Inferior ramus is 4c.
Latin	ramus inferior ossis pubis
Gray's	subject #57 237

The inferior pubic ramus is thin and flattened. It passes lateralward 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.

Contents 1 Surfaces 2 Borders 3 See also 4 External links

[edit] 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.

[edit] 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.

[edit] See also

• pubis (bone)

[edit] External links

• inferior+pubic+ramus at eMedicine Dictionary
• Cross section at UV pelvis/pelvis-e12-15
• pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (pelvislateral)

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.

v • d • e Bones of pelvis / pelvic cavity (TA A02.5.01-03, GA 2.231-241) General sacrum · coccyx · hip bone Ilium body arcuate line wing gluteal lines (posterior, anterior, inferior) iliac spines (anterior superior, anterior inferior, posterior superior, posterior inferior) other: crest · tuberosity · tubercle · fossa Ischium body ischial spine · lesser sciatic notch superior ramus tuberosity of the ischium inferior ramus no substructures Pubis body pubic crest superior ramus pubic tubercle · obturator crest inferior ramus pectineal line Compound acetabulum (acetabular notch) · iliopubic eminence / iliopectineal line · linea terminalis · ischiopubic ramus / pubic arch obturator foramen · greater sciatic foramen / greater sciatic notch · lesser sciatic foramen lesser pelvis (pelvic inlet, pelvic brim, pelvic outlet) · greater pelvis

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