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Fascial planes of the abdomen and pelvis. (a) Drawing of the retroperitoneum (green) in the sagittal plane shows the superior boundary formed by fusion of the posterior parietal peritoneum, Gerota fascia, and Zuckerkandl fascia with the undersurface of the diaphragm (arrow). (b) Drawing of the abdomen and pelvis in the sagittal plane shows the peritoneal cavity (blue) distinct from the retroperitoneal and extraperitoneal spaces.
