Mesothelium


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mesothelium

[‚me·zō′thē·lē·əm]
(anatomy)
The simple squamous-cell epithelium lining the pleural, pericardial, peritoneal, and scrotal cavities.
(embryology)
The lining of the wall of the primitive body cavity situated between the somatopleure and splanchnopleure.

Mesothelium

 

in vertebrates and man, the epithelial tissue that lines the serous membranes of the body cavity (peritoneum, pleura, pericardium).

Mesothelium is formed from mesoderm. It consists of a single layer of densely arranged flat polygonal cells. In lower vertebrates (cyclostomes, fish, amphibians), mesothelial cells are wholly or partly furnished with cilia. In mammals and man, the surfaces of the cells are covered with microvilli, which assist in the absorption and excretion of cavitary fluid. Mesothelium is highly sensitive to external influences. When the serous membranes are irritated and an inflammatory reaction results, the continuity of the mesothelial layer is interrupted, the cells are destroyed, and the underlying connective tissue is exposed. The connective tissue cells then penetrate the irritated area and phagocytize the dying tissue areas and, in septic inflammation, the bacteria. The connective tissue then proliferates, demarcating the focus of irritation and forming adhesions. Mesothelium grows over the adhesions, preventing them from further development and preventing visceral concrescence.

References in periodicals archive ?
This rare form of cancer occurs in the mesothelium, the protective lining of several organs and body cavities.
2013) showed that the mesothelium covering the inner side of the body wall in S.
The cysts termed coelomic pericardial cysts have thin walls and are layered with unilocular and endothelium or mesothelium and contain clear liquid.
Recent literature has examined the reliability of Glut-1 in discriminating between reactive and malignant mesothelium in histological sections.
Binding of Ovarian-Cancer Cells to Peritoneal Mesothelium in-Vitro Is Partly Mediated by CD44H.
A long-held theory is that they arise from metaplasia of the mesothelium of the tunica vaginalis, a concept proposed by Sundarasivarao, and supported by Ulbright and Young, and Lauchlan.
The epithelial layer, known as mesothelium, is responsible for the production of the lubricating serous fluid.
Examples of this type of epithelial tissue are the endothelium (inner lining of the heart and blood and lymph vessels), the mesothelium (inner lining of the body cavities), and the mesenchyme (embryonic connective tissue).
The mesothelium is composed of a single layer of cells and these cells can be seen in clumps or clusters that are only one cell thick.
Malignant cells develop in the mesothelium, a protective lining that covers most of the body's internal organs.
Under the law, the government covers out-of-pocket medical expenses and gives 100,000 yen in monthly recuperation fees to people confirmed as suffering from lung cancer or mesothelioma, a tumor of the mesothelium, often malignant and thought caused mainly by inhaling asbestos particles.
Cation exchange chromatography was used to determine the PAs levels in urine, peritoneal cells, circulating lymphocytes, spleenocytes, mesothelium and liver of BALB/c mice at days 10, 17 and 24 of tumoral evolution.