Trigonum lumbale superius
The superior lumbar triangle, also known as the triangle of Grynfeltt-Lesshaft, is one of the locations for a lumbar hernia. It is not to be confused with the adjacent inferior lumbar triangle (of Petit).
- medially: the quadratus lumborum muscle
- superiorly: twelfth rib
- laterally: internal oblique muscle
- floor: transversalis fascia and the aponeurosis of the transversus abdominis muscle of the abdomen
- roof: external oblique and latissimus dorsi muscles
History and etymology
J Grynfeltt and P Lesshaft independently described superior lumbar hernias in 1866 and 1870 , respectively.