Serous membrane

As a serous membrane ( serosa also ) refers to the smooth lining of the chest cavity ( glenoid pleuralis ), peritoneal cavity ( peritoneal cavity ) and the pericardium ( pericardial Cavitas ). It is shiny, transparent, and covered by a liquid film for a good displacement of internal organs. In contrast to the tunica adventitia, it has a layer of epithelium, which can limit the spread of cancer and inflammation.

Structure

The serosa is composed of two to three layers:

Serosaepithel

The directed towards the body cavity outer layer consists of single- squamous epithelium. It is derived from the mesodermal coelomic epithelium and is therefore also called the mesothelium. Between the mesothelial there are pores, can enter and exit through the liquid. The mesothelium is both secretory and resorptive active. The serous fluid film is also a product of the mesothelium.

Lamina propria serosae

Under the epithelium is the connective tissue lamina propria serosae. In this layer, run the blood and lymph vessels and nerves. Also to be found in the lamina propria cells of the immune system, which are called milk spots ( macula lactea ).

Tela subserosa

The connective tissue Tela subserosa acts as a sliding layer of organs where the fill levels and extent vary, such as the bladder or the stomach. In adipose tissue, this layer can be incorporated.

Regional breakdown

The serosa is called differently in the body cavities:

  • Pleura ( " pleura " ) in the thoracic cavity
  • Peritoneum ( " peritoneum " ) in the abdominal and pelvic cavities
  • Pericardium serosum in the pericardial cavity

Mesentery

The serosa dresses not only the wall of the body cavities. The organs located in the caves evert itself into this skin, like if you put an object on a slide and wrapping it. Therefore, all organs contained in the cavities of the body have a serosa, which is closely connected with the body surface and gives it a shiny appearance.

The resulting double lamella ( Serosaduplikatur ) between wall Journal of the serosa and the institution is referred to as the mesentery ( " mesentery "). It serves for fastening of the internal organs. The designation of each mesentery is performed by the prefix meso and the respective organ Latin names, such as mesoduodenum ( mesentery of the duodenum ) or mesorchium ( mesentery of the testicle ). In some organs, particular names have naturalized, such as the broad ligament of the uterus ( Gebärmuttergekröse ).

Large and small power

A special form of the mesentery are networks (lat. omenta, Greek epiploon ). Here, the bi-metallic strip is widely extended. It involves transformations of the two Magengekröse ( mesogastrium dorsal and ventral ). In mammals, including humans, there is a

  • Lesser omentum ( " small network " ): between the liver and the stomach and duodenum, somewhat artificially divided into hepatogastricum ligament and the hepatoduodenal ligament
  • Greater omentum ( " large network " ): as Fettgewebsschürze from the stomach over the cross intestine to navel height hanging.

In some animals (eg horse) is the greater omentum between the bowel loops.

Special education

Serosaduplikaturen can also communicate directly between adjacent organs. Such Serosabrücken is called

  • Ligament (band), eg ligament cecocolicum ( not to be confused with the purely fibrous bands on joints, which are also called " ligament " )
  • Plica ( fold ), eg, plica ileocaecalis

In some cases, " ligament " is also used for Serosaduplikaturen between organs and abdominal wall (eg ligamentum ovarii proprium, liver bands), in some cases also for sections of mesenteries (see above under " small network ").

Swell

  • Serosa
  • Histology
  • Epithelium
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