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Epithelium or epithelial tissue is a thin, continuous, protective layer of cells with little extracellular matrix. An example is the epidermis, the outermost layer of the skin. Epithelial (mesothelial) tissues line the outer surfaces of many internal organs, the corresponding inner surfaces of body cavities, and the inner surfaces of blood vessels.
Epithelioid cells gather around the focus of necrosis, in direct contact with the necrotic masses, forming a kind of boundary zone.. Structurally, epithelioid cells (when examined by light microscopy after stained with hematoxylin and eosin), are elongated, with finely granular, pale eosinophilic (pink) cytoplasm, and central, ovoid nuclei (oval or elongate), which are less dense than that of ...
The sheath is also responsible for multiple or accessory roots (medial growth) and lateral or accessory canals in the root (break in epithelium). [3] It is controversial, but HERS may be involved in cementogenesis and the secreting of cementum, or that HERS-derived products might be related to enamel-related molecules, and that these proteins might initiate acellular cementum formation.
The majority of IELs (80%) are CD3+, and over 75% of these also express CD8.IELs can be divided into two major subsets based on their CD8 coreceptor expression. [5] One subset of IELs typically express activation marker CD8αα and some IELs express CD8αβ + marker (CD8αβ promotes TCR activation, whereas CD8αα suppresses TCR signals).
The basement membrane acts as a mechanical barrier, preventing malignant cells from invading the deeper tissues. [7] Early stages of malignancy that are thus limited to the epithelial layer by the basement membrane are called carcinoma in situ. The basement membrane is also essential for angiogenesis (development of new blood vessels).
The cells in the respiratory epithelium are of five main types: a) ciliated cells, b) goblet cells, c) brush cells, d) airway basal cells, and e) small granule cells (NDES) [6] Goblet cells become increasingly fewer further down the respiratory tree until they are absent in the terminal bronchioles; club cells take over their role to some extent here. [7]
The problem of delivery, however, has still not been resolved as neural chimeras have been shown to circulate throughout the ventricles and incorporate into all parts of the CNS. By finding environmental cues of differentiation, neuroepithelial precursor transplantation could be used in the treatment of many diseases including multiple ...
Ten Cate, A.R. (December 1972). "The epithelial cell rests of Malassez and the genesis of the dental cyst". Oral Surgery, Oral Medicine, Oral Pathology.