It has two surfaces, anterolateral and posteromedial, which remain separated by the anterior and medial margins.Īnterolateral Surface: It is directed towards the thigh, running superiorly to the body of the pubis. It passes laterally and downward from the medial end of the superior ramus and becomes narrower as it descends to unite with the ischial ramus to complete the obturator foramen. The inferior pubic ramus is thin and flat, making up one-third of the pubis. It is limited by the pecten pubis above and the inferior border below. Pelvic surface: The pelvic surface is relatively smooth and faces posterosuperiorly. Obturator Surface: This surface faces posteroinferiorly and is bounded anteriorly by the obturator crest and inferiorly by its sharp inferior border. The pectineal and arcuate lines collectively form the linea terminalis or pelvic brim that separates the greater and lesser pelvis. The pectineal line is continuous with the arcuate line of the ilium. Pectineal (Anterior) Surface: Extending from the pubic tubercle to the iliopubic ramus, this surface is delimited anteriorly by the round obturator crest and by the pectineal line or pecten pubis posteriorly. It appears triangular in cross-section, having three surfaces. It starts at the pubic tubercle and extends posterolaterally and upwards to the acetabulum, joining the ilium and ischium. The superior pubic ramus is one-third of the pubic bone. This tubercle serves as a point of attachment for the inguinal ligament. On its lateral end, the pubic crest features the pubic tubercle. This crest separates the anterior and posterior surfaces of the bone.
Pubic Crest: The superior aspect of the body is marked by a rounded thickening called the pubic crest. In males, the arch is v-shaped, whereas, in females, it is usually broader. The curved area below the pubic symphysis is known as the pubic arch, one of the sexually dimorphic areas of the pelvis. Symphyseal (Medial) Surface: The medial surface of the pubic bone of left and right hip bones articulate with each other via symphyseal cartilage, forming t he pubic symphysis joint.
Internal (Posterior) Surface: This surface faces posterosuperiorly, forming the anterior wall of the lesser pelvis. This crest ends laterally as the pubic tubercle, where the medial end of the inguinal ligament attaches.Įxternal (Anterior) Surface: The smooth anterior surface faces the inferolateral side.
It marks the transition from external to internal surfaces. The body of the pubic bone has three surfaces - anterior (external), posterior (internal), and symphyseal (medial) - that merge, except at the pubic crest located at the anterosuperior part of the body.
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