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The mesothelium is a membrane composed of simple squamous epithelial cells of mesodermal origin, [2] which forms the lining of several body cavities: the pleura (pleural cavity around the lungs), peritoneum (abdominopelvic cavity including the mesentery, omenta, falciform ligament and the perimetrium) and pericardium (around the heart).
Cytology of normal mesothelium, with typical features. Wright's stain. The lateral plate mesoderm splits into the parietal (somatic) and visceral (splanchnic) layers. The formation of these layers starts with the appearance of intercellular cavities. [12] The somatic layer depends upon a continuous layer with mesoderm that covers the amnion.
For example, the serosa of the uterus is called the perimetrium. Schematic diagram of an organ invaginating into a serous cavity The pericardial cavity (surrounding the heart ), pleural cavity (surrounding the lungs ) and peritoneal cavity (surrounding most organs of the abdomen ) are the three serous cavities within the human body.
A tissue membrane is a thin layer or sheet of cells that covers the outside of the body (for example, skin), the organs (for example, pericardium), internal passageways that lead to the exterior of the body (for example, mucosa of stomach), and the lining of the moveable joint cavities. There are two basic types of tissue membranes: connective ...
The coelom (or celom) [1] is the main body cavity in many animals [2] and is positioned inside the body to surround and contain the digestive tract and other organs.In some animals, it is lined with mesothelium.
Specialized squamous epithelium also forms the lining of cavities such as in blood vessels (as endothelium), in the pericardium (as mesothelium), and in other body cavities. Cuboidal Cuboidal epithelial cells have a cube-like shape and appear square in cross-section. The cell nucleus is large, spherical and is in the center of the cell.
Diagrammatic view of exaggerated pleural space. Cytology of the normal mesothelial cells that line the pleurae, with typical features. [3] Wright's stain.. Each pleura comprises a superficial serosa made of a simple monolayer of flat (squamous) or cuboidal mesothelial cells with microvilli up to 6 μm (0.00024 in) long.
The most notable examples of basement membranes is the glomerular basement membrane of the kidney, by the fusion of the basal lamina from the endothelium of glomerular capillaries and the podocyte basal lamina, [9] and between lung alveoli and pulmonary capillaries, by the fusion of the basal lamina of the lung alveoli and of the basal lamina ...