Serosa consists of a secretory epithelial layer and also a thin connective tissue layer that reduce the friction native muscle movements.

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Key Points

The serous layer offers a partition between the inner organs and also the abdominal muscle cavity. Cells of the serous great secrete a serous fluid that gives lubrication to reduce friction. The connective tissue layer gives blood vessels and nerves. The 3 serous cavities in ~ the human body space the pericardial cavity (surrounding the heart ), the pleural cavity (surrounding the lungs), and also peritoneal cavity (surrounding many organs the the abdomen). The serous membrane consists the heart; it has actually an inner class (the parietal pericardium ) and an outer layer (the visceral pericardium). The serosa that the uterus is referred to as the perimetrium.

Key Terms

pleural cavity: The human body cavity that surrounds the lungs and also is attached by the pleura. coelom: A fluid-filled cavity in ~ the human body of one animal. The digestive system is suspended in ~ the cavity that is lined by a tissue dubbed the peritoneum. serosa: A membrane the lines an interior cavity to safeguard the contents and secretes serum.

The Serous Membrane

In anatomy, the serous membrane (or serosa) is a smooth membrane that is composed of a thin connective tissue layer and also a thin layer of cells the secrete serous fluid. Serous membranes line and also enclose several body cavities, well-known as serous cavities, where they secrete a lubricating liquid to mitigate friction indigenous muscle movements.

Serosa is not to be confused with adventitia, a connective tissue layer the binds with each other structures quite than reduce friction in between them.


Layers that stomach lining: The serosa is labeling at much right, and also is colored yellow.

Each serous membrane is created of a secretory epithelial layer and also a connective organization layer underneath. The epithelial layer, known as mesothelium, consists of a single layer that avascular flat nucleated cell (simple squamous epithelium) that create the lubricating serous fluid. This fluid has a consistency comparable to thin mucus.

These cells room bound tightly come the basic connective tissue. The connective organization layer provides the blood vessels and also nerves because that the overlying secretory cells, and also serves as the binding great that enables the totality serous membrane come adhere come organs and other structures.

For the heart, the neighboring serous membranes include: the outer, inner, parietal pericardium, and visceral pericardium (epicardium). Various other parts that the human body may likewise have particular names for these structures. For example, the serosa that the uterus is called the perimetrium.

The pericardial cavity (surrounding the heart), pleural cavity (surrounding the lungs) and also peritoneal cavity (surrounding most organs the the abdomen) space the three serous cavities in ~ the human being body. While serous membranes have actually a lubricative function to pat in all 3 cavities, in the pleural cavity it has a greater function to play in the function of breathing.

The serous cavities are indigenous the intraembryonic coelom and are usually an empty an are within the body surrounded by a serous membrane. Early on in embryonic life, visceral offal develop nearby to a cavity and also invaginate right into the bag-like coelom.

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Therefore each body organ becomes surrounding by a serous membrane—they perform not lie in ~ the serous cavity. The great in contact with the organ is well-known as the visceral layer, while the parietal class is in call with the body wall.


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