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| Fascia of the Piriformis ： ウィキペディア英語版 |
Piriformis fascia
The fascia of the Piriformis is very thin and is attached to the front of the sacrum and the sides of the greater 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 the Piriformis muscle.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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