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Angiogenesis is a crucial process for development of organs in the embryo and fetus, [12] as well as repair of damaged areas. [13] The process is triggered by decreased tissue oxygen (hypoxia) or insufficient oxygen tension leading to the new development of blood vessels lined with endothelial cells.
The blood–brain barrier is formed by special tight junctions between endothelial cells lining brain blood vessels. Blood vessels of all tissues contain this monolayer of endothelial cells, however only brain endothelial cells have tight junctions preventing passive diffusion of most substances into the brain tissue. [1]
The ependyma is made up of ependymal cells called ependymocytes, a type of glial cell. These cells line the ventricles in the brain and the central canal of the spinal cord, which become filled with cerebrospinal fluid. These are nervous tissue cells with simple columnar shape, much like that of some mucosal epithelial cells. [2]
These cell types accelerate the healing process and prevent further complications such as hypoxia by gathering the cellular materials to reconstruct the endothelium. [19] Endothelium dysfunction is a prototypical characteristic of vascular disease, which is common in patients with autoimmune diseases such as systemic lupus erythematosus. [20]
The permeability of a capillary wall is determined by the type of capillary and the surface of the endothelial cells. A continuous, tightly spaced endothelial cell lining only permits the diffusion of small molecules. Larger molecules and blood cells require adequate space between cells or holes in the lining.
In anatomy the term reticuloendothelial system (abbreviated RES), often associated nowadays with the mononuclear phagocyte system (MPS), was employed by the beginning of the 20th century to denote a system of specialised cells that effectively clear colloidal vital stains (so called because they stain living cells) from the blood circulation.
Dark chocolate is a great source of a powerful antioxidant called flavonoids. “Since the brain is particularly vulnerable to oxidative stress, which leads to age-related cognitive loss and brain ...
When lesions are made on the brain surface, meningeal cells will divide and migrate into the lesion, eventually lining the entire injury cavity. If the injury has significantly reduced the density of astrocytes and created space within the tissue, the meningeal cells will invade even more diffusely.