<prompt> Grynfeltt triangle not bounded by12th ribParaspinal musclesInternal oblique muscleExternal oblique muscle  <response>: Lumbar hernias- Hernias through the superior lumbar triangle Grynfeltt triangle are more common and bounded by the 12th rib, paraspinal muscles, and internal oblique muscle. Inferior Lumbar Petit triangle- bounded by the iliac crest, latissimus dorsi muscle, and external oblique muscle. 