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Peritoneum: Your Core from the Inside

The word peritoneum derives from the Greek for “stretched over,” evoking an irresistible comparison to plastic cling wrap. The peritoneum is a smooth, translucent membrane less than 1mm thick. It covers the inside of the abdominal and pelvic cavities, stretching over and clinging to each of the abdominal and pelvic organs. By encasing the organs, it allows them to slip and slide over one another with ease. Imagine you are standing in an upright form, looking up. Hovering overhead, you can see the dome of the diaphragm arching over you like a rotunda. Facing front, you see the posterior rectus sheath encircling you with the transversalis fascia and transversus abdominis behind it. Turning around,…

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 Peritoneum – The Thin Wall Between Life and Rot

It’s called the peritoneum. And no one talks about it. This isn’t just tissue. It’s memory. It’s rot. It’s the forgotten gateway between inflammation and infection. Between order and overload. A soft, almost invisible lining that wraps around your abdominal organs — like plastic wrap over leftovers. Except the leftovers are trauma. Inflammation. Scar tissue. Leaking bacteria. And yes — sometimes dead parasites, pus, microplastics, and mold particles.

Articles of Interest

The Many Faces of the Angry Peritoneum

The peritoneum is composed of compartments and reflections that significantly influence the development and dissemination of disease. Recognizing normal anatomical structures is essential for distinguishing pathological alterations, such as abnormal fluid accumulations or tumor implants. Various pathologies—malignant, infectious, or inflammatory—tend to follow specific dissemination pathways within the peritoneal cavity.

EFKS - Peritoneum-on-Chip

The peritoneum is the largest serous membrane of the human body, located in the abdominal and pelvic cavity. It ensures the physiology of peristaltic movements and fertility. Additionally, it has an important immunological function. Peritoneal adhesions are estimated to be found after 63%-97% of all abdominal surgeries and may lead to severe and difficult to localize chronic pain syndromes, secondary infertility, and mechanic ileus diseases. Moreover, the peritoneum plays an important role in the development of primary tumors and especially in the context of metastasis of various carcinomas.

Functional vascular anatomy of the peritoneum in health and disease

Peritoneal diseases (such as peritonitis or peritoneal metastasis) are common and often result in life-threatening conditions. However, investigations on pathophysiology of these diseases are relatively rare, at least when the numbers are compared to diseases affecting other organs.

Peritoneum, Mesentery, and Omentum

The term mesentery tends to be used as a generic term describing peritoneal extensions not only from the intestine (as -entery implies), but from all abdominal and pelvic organs. To be more precise, and less offensive to language purists, sections of peritoneum that suspend specific organs are individually named; for example, mesogastrium for the stomach, mesojejunum for the jejunum and mesometrium for the uterus. An important feature of mesentery is that it serves as a conduit for blood vessels, nerves and lymphatic vessels going to and from the organ in question. The image below shows a loop of small intestine from a mouse. The glistening membrane inside the loop of bowel is mesentery; mesenteric blood vessels running through bundles of fat are clearly visible.

The Normal Peritoneum

This chapter reviews the anatomy, physiology and histology of the normal peritoneum. It discusses its embryological development, which is important in understanding how congenital abnormalities, especially hernias, arise and the compartmentalisation of the peritoneal cavity, which is important in understanding the spread of intra-abdominal inflammation and neoplasia.

The peritoneum and the pneumoperitoneum: a review to improve clinical outcome

The pneumoperitoneum has a direct effect on the peritoneum and influences the outcome of laparoscopic surgery. The quality of the gas used, its temperature and dryness cause physical and chemical alterations that are preventable

The Peritoneum: Beyond the Tissue – A Review

Recent evidence on the anatomy, histology, and physiology of the peritoneum, shows that this structure is more complex than a simple serous membrane. These results call for a new conceptualization of peritoneum, and highlight the need of adequate research for identifying clinical relevance of this knowledge.

Resources

KenHub

Although in adults the peritoneum looks like it’s scattered all over the place, there is a (embryo)logic reason behind it. During intrauterine development, the parietal peritoneum forms a closed sac occupying most of the abdominal cavity. At this time, abdominal organs are small and pressed against the posterior abdominal wall.

PressBooks

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.

StatPearls

The potential space between the 2 layers contains about 50 to 100 ml of serous fluid that prevents friction and allows the layers and organs to glide freely] The outer layer is the parietal peritoneum, which attaches to the abdominal and pelvic walls. The inner visceral layer wraps around the internal organs located inside the intraperitoneal space. The structures bound by the peritoneal cavity may be intraperitoneal or retroperitoneal.

TeachMe Anatomy

The peritoneum is a continuous membrane which lines the abdominal cavity and covers the abdominal organs (abdominal viscera). It acts to support the viscera, and provides pathways for blood vessels and lymph to travel to and from the viscera.

Vedantu

The peritoneum is supported by a thin layer of connective tissue over the mesothelium cells layer lining. The physiology of the peritoneum is not just limited to a membrane lining it serves many purposes.