Lumbar Triangle
From Gomerpedia
The lumbar triangle actually consists of two different triangles: (1) the superficial inferior lumbar triangle (or Petit triangle), and external abdominal oblique and (2) the deep superior lumbar triangle (or Grynfeltt-Lesshaft triangle.
Did You Know
If you are unsuccessful with a lumbar puncture, you can always consider inserting the spinal needle into the left or right lumbar triangles. We're not saying it'll work, just that you can consider doing it.
Other Shapes
