Secondary Retroperitonealization

Most of the gut tube retains only a dorsal mesentery. The absence of a ventral mesentery allows for mobility of the gut. Parts of the gut tube (most of the duodenum, ascending colon, descending colon, part of rectum) fuse with the body wall by way of fusion of visceral peritoneum with i parietal peritoneum. This results in the organ becoming secondarily retroperitoneal and die viscera] peritoneum covering the organ being renamed as the parietal peritoneum. The mesentery attaching to the organ also is renamed as the parietal peritoneum, and vessels within the mesentery become secondarily retroperitoneal.

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