- Lumbar triangle
Infobox Anatomy
Name = Lumbar triangle
Latin = trigonum lumbale
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Caption = The superior and inferior lumbar triangles with a cross section at the level of the superior lumbar triangle
Caption2 = Posterior view of muscles connecting the upper extremity to the vertebral column. Lumbar triangle is labeled in red at bottom left.
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The lumbar triangle can refer to either the inferior lumbar (Petit) triangle, which lies superficially, and the superior lumbar (Grynfeltt) triangle,cite journal |author=Guillem P, Czarnecki E, Duval G, Bounoua F, Fontaine C |title=Lumbar hernia: anatomical route assessed by computed tomography |journal=Surg Radiol Anat |volume=24 |issue=1 |pages=53–6 |year=2002 |month=February |pmid=12197011 |doi= |url=] which is deep and superior to the inferior triangle. Of the two, the superior triangle is the more consistently found incadavers , [Goodman, E. H. and Speese, J.: Lumbar Hernia. Ann. Surg., 63:548, 1916.] and is more commonly the site ofherniation ; 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 inferior lumbar (Petit) triangle is formed medially by the
latissimus dorsi muscle ; [GPnotebook|-19922898] laterally by theexternal abdominal oblique muscle ; and inferiorly by theiliac crest . The floor of the inferior lumbar triangle is theinternal abdominal oblique muscle .uperior lumbar (Grynfeltt) triangle
The superior lumbar (Grynfeltt) triangle is formed medially by the
quadratus lumborum muscle , laterally by theinternal abdominal oblique muscle , and superiorly by the 12th rib. The floor of the superior lumbar triangle is thetransversalis fascia and its roof is the external abdominal oblique muscle.External links
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References
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