![]() Gynecoid: This structure is seen in about 50% of women and is considered the standard shape of the female pelvis.The lower portion of the ramus joins with the pubic bone to bound the pubic arch, the lowest portion of the hip bone. It has a front-facing (anterior) and rear-facing (posterior) portion, the latter of which is further divided into perineal and pelvic areas. Ramus of the ischium: This is the curved upper portion of the bone that completes the obturator foramen.Pelvic surface: Facing the cavity of the pelvis, this flat, smooth surface lies just above ischiorectal fossa (the opening to the side of the anal canal, which is the lowest portion of the digestive system).Its rear (dorsal) border forms the greater and lesser sciatic notches, which are ridges separated by the spine (a protrusion) of the ischium. Dorsal surface: This surface of the bone runs alongside the iliac gluteal surface-the external wing of the ilium (a major part of the hip joint)-and forms the upper portion of the ischial tuberosity.It forms the outside limit of the ischial tuberosity, also known as the seat bone, a large swelling toward the back from the upper portion of the ischium. Femoral surface: Facing downward and forward, this surface is bounded by the obturator foramen, one of the two large openings at both sides of the hip bone.
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