Final answer:
Certain abdominal organs, like the duodenum, pancreas, ascending and descending colons, and the rectum, are retroperitoneally located, meaning they lie behind the peritoneum and to the right of the midline, not enclosed by the peritoneum.
Step-by-step explanation:
The question pertains to organs that are extruded to the right of the midline and are not enclosed by the peritoneum, suggesting they are in a retroperitoneal position. The peritoneum is a membranous sac that consists of the parietal peritoneum, lining the abdominal wall, and the visceral peritoneum, which covers the abdominal organs. Some organs are retroperitoneal, meaning they are positioned behind the peritoneum, including the duodenum, pancreas, ascending and descending colons, and the rectum. These organs remain either completely or partially posterior to the peritoneum. They are held against the posterior abdominal wall and are only covered anteriorly by peritoneum, hence they are not 'sealed' within the peritoneal cavity.