Fig. 25-13. Muscles of the posterior abdominal wall. A, Quadratus lumborum and iliopsoas. In B, the diaphragm has been added and the arcuate ligaments have been indicated. The outline of the right suprarenal, kidney and ureter are shown. Defects in the diaphragm (diaphragmatic herniae), many of which are congenital, are most frequent around the esophageal opening (hiatal herniae). Other defects are commoner on the left than on the right side. In B, a congenital defect (vertebrocostal trigone) on the left side would result in close contact between the left kidney and pleura. Click for high resolution image.