The main distinction of the peritoneum and retro-peritoneum is mainly the placement between them. The peritoneum lines the abdominal cavity, and the retroperitoneum lies behind it.
The kidney and other organs in the retroperitoneal space give it a distinct structure from the peritoneum.
Peritoneum vs Retroperitoneum
The difference between peritoneum and retroperitoneum is that peritoneum is the serous membrane that lines the coelom in some invertebrates, including annelids and amniotes, and the abdominal cavity in vertebrates.
It is composed of a layer of mesothelium that is supported by a thin layer of connective tissue and it covers the majority of the organs that are located within the abdomen (also known as coelomic organs)..
On the other hand, the retroperitoneum is a region that is in front of the transversalis fascia and behind the peritoneum. According to the notion of interfacial spread, it contains additional compartments divided by fasciae, between which communication is possible with both the peritoneal cavity and the pelvis.
|Parameters of Comparison||Peritoneum||Retroperitoneum|
|Organs enclosed||The first and fourth regions of the duodenum, the liver, the jejunum, the ileum, the transverse colon, and the sigmoid colon.||The second and third sections of the duodenum, the aorta, the kidneys, the ureters, the ascending and descending colon, and the adrenal glands|
|Diseases||Peritoneum diseases include peritonitis, hernia just to mention but a few.||Some of the related diseases include tumors and not forgetting fibrosis… etc.|
|The location in abdominal cavity||It is located at the front section.||It is located at the rear section.|
|Assist with||aids in keeping the organs in place and secretes a lubricant to minimize friction when they rub.||lines the belly wall and protects the majority of the organs.|
|Comprised of||consisting of two layers, the deep visceral layer and the superficial parietal layer.||is a physical space that exists behind the peritoneal or abdominal cavity.|
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What is Peritoneum?
Peritoneum also known as the serosal, it’s a membrane enclosing the abdominal organs and lining the abdominal cavity, it aids in keeping the organs in place.
Your abdominal and pelvic walls are lined with parietal peritoneum, and your organs are encased with visceral peritoneum, which acts as a lubricant to lessen friction when they rub against one another.
The peritoneal cavity is the area between. includes a layer of loose connective tissue on top of a layer of flattened mesothelial cells.
The peritoneum consists of two continuous layers: the parietal and the visceral. Both forms consist of mesothelium, which are straightforward squamous epithelial cells.
The peritoneal cavity, which contains a tiny amount (about 50 mL) of slick serous fluid that permits the two layers to smoothly slide over one another, serves as the possible space between these two layers.
The right and left subhepatic compartments are connected by the right paracolic gutter. The greater sac and the lesser sac can communicate with each other through the epiploic foramen. In contrast to how the peritoneal space in females is connected to the extraperitoneal pelvis by holes in the uterus, fallopian tubes, and vagina, the peritoneal space in males is closed.
What is Retroperitoneum?
The organs located in the retroperitoneum are the adrenal glands, aorta, kidneys, an esophagus, ureters, pancreas rectum, and parts of the stomach and colon. The region that lies behind the peritoneum, which is the tissue that lines the abdominal wall and covers the majority of the abdomen, is known as the retroperitoneum.
Inflammation of the retroperitoneum is a serious condition that carries with it the potential for fatal outcomes. Serious effects may result when inflammation affects your abdominal organs, like your abdominal aorta. This important blood channel transports oxygen-rich blood to your lower body.
Its anatomical location is behind the abdominal cavity or peritoneal cavity. Organs lying between the abdominal wall and parietal peritoneum that are not suspended by the mesentery are referred to as being in the retroperitoneum.
Borders of the retro peritoneum are the transversalis fascia, psoas, quadratus lumborum, and diaphragm facias border the retroperitoneal region on either side of the posterior abdominal wall (laterally).
In addition, it has five major areas, including the right subphrenic space. Correct subhepatic region. right subhepatic anterior space Lesser sac in the posterior right subhepatic region (Morison pouch). eponymous foramen (of Winslow).
Main Differences Between Peritoneum and Retroperitoneum
- The position of the peritoneum and the retroperitoneum within the body is the primary distinction between the two. The peritoneum is found in the front of the body, while the retroperitoneum is found in the back.
- The retroperitoneal space is situated behind the peritoneum and is divided from the former by the parietal peritoneum while the peritoneum is a double-layered sheet that protects the organs in the abdominal cavity.
- Peritoneum consists of diseases such has hernia while retroperitoneum consists of diseases like fibrosis.
- The adrenal glands are located in the retroperitoneum, while the ileum is located in the peritoneum.
- The prefix ‘retro’ in retroperitoneum indicates ‘behind,’ implying that the retroperitoneum is located behind the peritoneum.
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Piyush Yadav has spent the past 25 years working as a physicist in the local community. He is a physicist passionate about making science more accessible to our readers. He holds a BSc in Natural Sciences and Post Graduate Diploma in Environmental Science. You can read more about him on his bio page.