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The epithelial layer of cells lining the heart and vessels of the circulatory system.



a tissue found in animals and man consisting of specialized cells that line the inner surfaces of blood and lymph vessels, as well as the cavities of the heart. The endothelium is formed from the mesenchyme. It consists of a single layer of closely packed flat cells, which are usually separated from underlying tissues by a basal membrane. The endothelium of lymph vessels has no basal membrane. The cytoplasm of endothelial cells of certain capillaries may have pores that account for the permeability of the capillary wall, as, for example, in the renal glomeruli.

The endothelium of the enlarged capillaries of the blood-forming organs and the endothelium present in the liver, adrenal cortex, and certain other organs has a great capacity for phagocytosis. The endothelial cells of these organs belong to the reticuloendothelial system.

References in periodicals archive ?
To investigate whether EOFAZ-incluced relaxation was endothelium dependent or not, experiments were performed in both endothelium-with and--without aortic rings precontracted by NE 1.
In our experiments, performed by the method of intravenous injections of India ink according to McJunkin and Foot, we failed to find any proof for the presumed active participation of the endothelium of blood vessels in the formation of polyblasts.
Some people's endothelium knows exactly what to do with fat without storing it in blood vessel walls.
The beneficial effect of the Crataegus treatment on aging-related endothelium dependent contractile responses is most likely explained by the normalization of the vascular expression of COX-1 and COX-2 and vascular oxidative stress.
Damage to the vascular endothelium alters the formation and release of endothelial factors.
Physiological stress on the endothelium from ocular pathology or contact lens wear can result in changes in the shape of endothelial cells, deviating away from the normal hexagonal morphometry.
I propose a project aimed at elucidating the regulatory gene networks responsible for the development of the endothelium in A.
Key words: Testosterone, vasodilatation, endothelium, coronary artery, sheep
Vita concluded, "The study examined endothelium dependent dilation of the brachial artery in 42 patients with coronary artery disease at baseline and two hours after a 300 mg oral dose of EGCG and after placebo.
In addition, higher concentrations of arsenite decreased the relaxation induced by sodium nitroprusside (an NO donor) and 8-Br-cGMP (a cGMP analog) in aortic rings without endothelium.

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