Examples of retroperitoneal in the following topics:
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- For example, a kidney is inside the abdominal cavity, but is retroperitoneal—located outside the peritoneum .
- Retroperitoneal structures include the rest of the duodenum, the ascending colon, the descending colon, the middle third of the rectum, and the remainder of the pancreas.
- Other organs located in the retroperitoneal space are the kidneys, adrenal glands, proximal ureters, and renal vessels.
- Structures that are intraperitoneal are generally mobile, while those that are retroperitoneal are relatively fixed in their location.
- Some structures, such as the kidneys, are primarily retroperitoneal, while others such as the majority of the duodenum, are secondarily retroperitoneal, meaning that structure developed intraperitoneally, but lost its mesentery and thus became retroperitoneal.
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- The next lymph sac to appear is the unpaired retroperitoneal lymph sac at the root of the mesentery of the intestine.
- Capillary plexuses and lymphatic vessels spread from the retroperitoneal lymph sac to the abdominal viscera and diaphragm.
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- They are considered retroperitoneal, which means that they lie behind the peritoneum, the membrane lining of the abdominal cavity.
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- The structures within the intraperitoneal space are called "intraperitoneal" (e.g. the stomach), the structures in the abdominal cavity that are located behind the intraperitoneal space are called "retroperitoneal" (e.g. the kidneys), and those structures below the intraperitoneal space are called "subperitoneal" or "infraperitoneal" (e.g. the bladder).