| lumbar triangle | An area in the posterior abdominal wall bounded by the edges of the latissimus dorsi and external oblique muscles and the iliac crest; herniations occasionally occur here. Synonym: trigonum lumbale, Petit's lumbar triangle. (05 Mar 2000) |
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| lumbocostoabdominal triangle | An irregular area bounded by the serratus posterior inferior, obliquus externus, obliquus internus, and erector spinae muscles. (05 Mar 2000) |