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a natural opening or perforation through a bone or a membranous structure (同)hiatus
marine microorganism having a calcareous shell with openings where pseudopods protrude (同)foraminifer

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/04/09 05:36:52」(JST)

The greater sciatic foramen is a major foramen or fossa of the human pelvis. It is formed by the sacrotuberous and sacrospinous ligaments.

It is bounded as follows:

The piriformis, which exits the pelvis through the Greater sciatic foramen, occupies most of the foramen.

The following structures also make their exit from the pelvis through the greater sciatic foramen:

Location	Name	Vessels	Nerves
Above the Piriformis	suprapiriform foramen^[1]	superior gluteal vessels	superior gluteal nerve
Below the Piriformis	infrapiriform foramen^[1]	inferior gluteal vessels internal pudendal vessels	inferior gluteal nerve pudendal nerve sciatic nerve posterior femoral cutaneous nerve Nerve to obturator internus Nerve to quadratus femoris

The foramen contains:^{[citation needed]}

7 nerves:
- Sciatic Nerve:
- Superior Gluteal Nerve:
- Inferior Gluteal Nerve:
- Pudendal Nerve:
- Posterior Femoral Cutaneous Nerve
- Nerve to Quadratus Femoris
- Nerve to Obturator Internus
3 Vessel Sets:
- Superior Gluteal Artery & Vein
- Inferior Gluteal Artery & vein
- Internal Pudendal Artery & vein
1 Muscle:
- Piriformis^[2]

The structures contained within the foramen are represented by a mnemnoic.

This article incorporates text from a public domain edition of Gray's Anatomy.

^ ^a ^b Yokochi, Chihiro; Rohen, Johannes W.. Color Atlas of Anatomy: A Photographic Study of the Human Body. Hagerstown, MD: Lippincott Williams & Wilkins. p. 482. ISBN 0-7817-9013-1.
^ http://www.wheelessonline.com/ortho/greater_sciatic_foramen

Anatomy photo:41:os-0109 at the SUNY Downstate Medical Center
Greater_sciatic_foramen at the Duke University Health System's Orthopedics program
glutealregion at The Anatomy Lesson by Wesley Norman (Georgetown University) (glutealart, glutealner)

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1. 卵円孔開存 patent foramen ovale
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[Simplified sciatic nerve approach by the posterior route at the median gluteus-femoral sulcus region, with a neurostimulator.].

Fonseca NM1, Ferreira FX, Ruzi RA, Pereira GC.
Revista brasileira de anestesiologia.Rev Bras Anestesiol.2002 Nov;52(6):764-73.
BACKGROUND AND OBJECTIVES: The sciatic nerve may be blocked by several routes, all of them with advantages and disadvantages. It is the largest human nerve in diameter and length, being the prolongation of the upper sacral plexus fascicle (L4, L5, S2 and S3). It leaves the pelvis through the foramen
PMID 19475249

Possibility of blocking n. ischiadicus within foramen ischiadicum majus in sheep.

Maticić D1, Mihelić D, Zobundzija M, Brkić A, Babić K, Gjurcević-Kantura V, Capak D, Susić V.
Veterinární medicína.Vet Med (Praha).1996 Sep;41(9):273-8.
The blocking of the ischiadic nerve within foramen ischiadicus majus of 8 sheep was performed with 6-12 ml 2% xylocain from three different places: 1. From the middle of a line joining the top of processus spinosus of the 1st sacral vertebra and the peak of trochanter major. The needle pierces verti
PMID 8905998

Greater sciatic foramen
	Articulations of pelvis, anterior view, with greater sciatic foramen (labeled in red) and its boundaries.
	Muscles of the gluteal and posterior femoral regions, piriformis labeled
Details
Latin	foramen ischiadicum majus
Identifiers
Gray's	p.309
Dorlands; /Elsevier	sciatic foramen
TA	A03.6.03.008
FMA	17031
	Anatomical terminology