greater sciatic foramen


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Related to greater sciatic foramen: obturator foramen, Piriformis, pudendal nerve, Greater sciatic notch

greater sciatic foramen

Etymology: AS, great + Gk, ischiadikos, hip joint; L, foramen, hole
a major route of communication between the pelvic cavity and the lower limb, formed by the greater sciatic notch in the pelvic bone, the sacrotuberous and sacrospinous ligaments, and the spine of the ischium.

greater sciatic foramen

The larger of two posterior openings into the bony pelvis. Along the back edge of the ilium and ischium bones, there are two semicircular indentations, the greater and lesser sciatic notches. Two crossed ligaments (the sacrotuberous and sacrospinous ligaments) make these notches into enclosed ovals, the greater and lesser sciatic foramena. The greater sciatic foramen is the upper and larger of these. The gluteal and some hip-joint structures, such as the piriformis muscle and the gluteal nerves and blood vessels, leave the pelvic cavity through this opening, as do the sciatic nerve and the posterior cutaneous nerve of the thigh.
See also: foramen
References in periodicals archive ?
It runs through the lower part of the greater sciatic foramen to reach the gluteal region (Fig.
PSA was seen as continuation of the left common iliac artery, passing out of the pelvis via the greater sciatic foramen.
The PSA arises from internal iliac artery and runs through greater sciatic foramen below the piriformis muscle and lies adjacent to sciatic nerve in the gluteal region and thigh.
It runs laterally through the greater sciatic foramen, becomes tendinous, and inserts into the piriformis fossa at the medial aspect of the greater trochanter of the femur.

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