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lumbar triangle
The lumbar triangle can refer to either the inferior lumbar (Petit) triangle, which lies superficially, or the superior lumbar (Grynfeltt) triangle, which is deep and superior to the inferior triangle. Of the two, the superior triangle is the more consistently found in cadavers,〔Goodman, E. H. and Speese, J.: Lumbar Hernia. Ann. Surg., 63:548, 1916.〕 and is more commonly the site of herniation; however, the inferior lumbar triangle is often simply called the lumbar triangle, perhaps owing to its more superficial location and ease in demonstration.
==Inferior lumbar (Petit) triangle==
The margins of the inferior lumbar (Petit's) triangle are composed of the iliac crest inferiorly and the margins of two muscles – latissimus dorsi (posteriorly) and external abdominal oblique (anteriorly). The floor of the inferior lumbar triangle is the internal abdominal oblique muscle. The fact that herniations occasionally occur here is of clinical importance.〔http://www.wrongdiagnosis.com/medical/inferior_lumbar_triangle.htm〕
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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