- Fascia of the Piriformis
Infobox Anatomy
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The fascia of the Piriformis is very thin and is attached to the front of thesacrum and the sides of thegreater sciatic foramen ; it is prolonged on the muscle into the gluteal region.At its sacral attachment around the margins of the
anterior sacral foramina it comes into intimate association with and ensheathes the nerves emerging from these foramina.Hence the
sacral nerves are frequently described as lying behind the fascia.The
internal iliac vessels and their branches, on the other hand, lie in the subperitoneal tissue in front of the fascia, and the branches to the gluteal region emerge in special sheaths of this tissue, above and below thePiriformis muscle .
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