| Lesshaft's triangle | A triangular space bounded above by the end of the last rib and the serratus posterior inferior muscle, anteriorly by the internal oblique, and posteriorly by the quadratus lumborum; lumbar hernia occurs in this space. Synonym: Lesshaft's triangle. (05 Mar 2000) |
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| Lieutaud's triangle | A triangular smooth area at the base of the bladder between the openings of the two ureters and that of the urethra. Synonym: trigonum vesicae, Lieutaud's body, Lieutaud's triangle, Lieutaud's trigone, vesical triangle. (05 Mar 2000) |
| 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) |
| lumbocostoabdominal triangle | An irregular area bounded by the serratus posterior inferior, obliquus externus, obliquus internus, and erector spinae muscles. (05 Mar 2000) |