inferior lumbar triangle



The inferior lumbar triangle, also known as the Petit triangle, is an anatomical space through which inferior lumbar hernias can occur. It is not to be confused with the adjacent superior lumbar triangle (of Grynfeltt-Lesshaft).
Gross anatomy
Boundaries
- inferiorly: iliac crest
- anteriorly: external oblique muscle
- posteriorly: latissimus dorsi muscle
- floor: internal oblique muscle
Related pathology
History and etymology
The first description of the inferior or superficial lumbar hernia by French surgeon Jean-Louis Petit (1672-1750) in 1738 .
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