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Not to be confused with Perineum.
The peritoneum is the blood vessels, lymph vessels, and nerves.
The abdominal cavity (the space bounded by the vertebrae, abdominal muscles, diaphragm, and pelvic floor) should not be confused with the intraperitoneal space (located within the abdominal cavity, but wrapped in peritoneum). 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).
Although they ultimately form one continuous sheet, two types or layers of peritoneum and a potential space between them are referenced:
Peritoneal folds are omenta, mesenteries and ligaments; they connect organs to each other or to the abdominal wall.[2] There are two main regions of the peritoneum, connected by the epiploic foramen (also known as the omental foramen or foramen of winslow):
The blood and lymph vessels and nerves.
In addition, in the pelvic cavity there are several structures that are usually named not for the peritoneum, but for the areas defined by the peritoneal folds:
The structures in the abdomen are classified as intraperitoneal, retroperitoneal or infraperitoneal depending on whether they are covered with visceral peritoneum and whether they are attached by mesenteries (mensentery, mesocolon).
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.
The peritoneum develops ultimately from the mesoderm of the trilaminar embryo. As the mesoderm differentiates, one region known as the lateral plate mesoderm splits to form two layers separated by an intraembryonic coelom. These two layers develop later into the visceral and parietal layers found in all serous cavities, including the peritoneum.
As an Peritoneal folds develop from the ventral and dorsal mesentery of the embryo.[2] Clinical significance Peritoneal dialysis In one form of dialysis, called peritoneal dialysis, a glucose solution is sent through a tube into the peritoneal cavity. The fluid is left there for a prescribed amount of time to absorb waste products, and then removed through the tube. The reason for this effect is the high number of arteries and veins in the peritoneal cavity. Through the mechanism of diffusion, waste products are removed from the blood. Primary peritoneal carcinoma Primary peritoneal cancer is a cancer of the cells lining the peritoneum. History Etymology Peritoneum is derived from Greek via Latin. Peri- means around, while -ton- refers to stretching. Thus, peritoneum means stretched around or stretched over. Additional images Urinary Bladder Median sagittal section of pelvis, showing arrangement of fasciæ. Horizontal disposition of the peritoneum in the lower part of the abdomen. Sagittal section through posterior abdominal wall, showing the relations of the capsule of the kidney. Topography of thoracic and abdominal viscera. Horizontal disposition of the peritoneum in the upper part of the abdomen References ^ Tank, P. (2013) Grants Dissector 15th ed., ch.4 The abdomen, p.99 ^ a b Drake et al. (2009) Grays Anatomy for Students, 2nd Edition, Abdominal Viscera, p.406 Tortora, Gerard J., Anagnostakos, Reginald Merryweather, Nicholas P. (1984) Principles of Anatomy and Physiology, Harper & Row Publishers, New York ISBN 0-06-046656-1 External links Anatomy photo:37:03-0102 at the SUNY Downstate Medical Center Overview and diagrams at colostate.edu
Peritoneal folds develop from the ventral and dorsal mesentery of the embryo.[2]
In one form of dialysis, called peritoneal dialysis, a glucose solution is sent through a tube into the peritoneal cavity. The fluid is left there for a prescribed amount of time to absorb waste products, and then removed through the tube. The reason for this effect is the high number of arteries and veins in the peritoneal cavity. Through the mechanism of diffusion, waste products are removed from the blood.
Primary peritoneal cancer is a cancer of the cells lining the peritoneum.
Peritoneum is derived from Greek via Latin. Peri- means around, while -ton- refers to stretching. Thus, peritoneum means stretched around or stretched over.
Urinary Bladder
Median sagittal section of pelvis, showing arrangement of fasciæ.
Horizontal disposition of the peritoneum in the lower part of the abdomen.
Sagittal section through posterior abdominal wall, showing the relations of the capsule of the kidney.
Topography of thoracic and abdominal viscera.
Horizontal disposition of the peritoneum in the upper part of the abdomen
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