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  • secretion
  • In the fetal lung, the epithelium actively secretes Cl− fluid secretion is a major requirement for normal pulmonary growth and development. (springer.com)
  • Secretion: The RPE is an epithelium which closely interacts with photoreceptors on one side but must also be able to interact with cells on the blood side of the epithelium, such as endothelial cells or cells of the immune system. (wikipedia.org)
  • cells
  • Epithelium , in anatomy, layer of cells closely bound to one another to form continuous sheets covering surfaces that may come into contact with foreign substances. (britannica.com)
  • In stratified epithelium, which is found in the epithelium of the skin and of many mucous membranes ( e.g., mouth, esophagus, rectum, conjunctiva, vagina), the surface cells are flattened, those of the middle layer are polyhedral, and those of the lowest layer are cubical or columnar. (britannica.com)
  • In stratified ciliated epithelium the superficial cells are ciliated and columnar. (britannica.com)
  • The respiratory epithelium forms a continuous layer of cells that separates air from liquid throughout the lung. (springer.com)
  • Epithelium made up of a series of layers, the cells of each varying in size and shape. (dictionary.com)
  • The outer layer of this is a ciliated epithelium or layer of cells. (dictionary.com)
  • The intestinal epithelium is the layer of cells that forms the luminal surface or lining of both the small and large intestine (colon) of the gastrointestinal tract. (wikipedia.org)
  • Some diseases and conditions are caused by dysfunction in the intestinal epithelium, and some diseases and conditions cause problems with these cells, which then leads to further complications. (wikipedia.org)
  • The epithelium is composed of a single layer of cells. (wikipedia.org)
  • In this way, the total number of cells making up the intestinal epithelium remains constant. (wikipedia.org)
  • The basal layer fosters the epithelial stem cells in order to provide constant renewal of the epithelium. (wikipedia.org)
  • There are two types of supporting cells in the olfactory epithelium: sustentacular cells and microvillar cells. (wikipedia.org)
  • The sustentacular cells function as metabolic and physical support for the olfactory epithelium. (wikipedia.org)
  • During gonadal sex development, the coelomic epithelium, additionally with germ cells and mesenchymal cells make the indifferent gonad. (wikipedia.org)
  • As the coelomic epithelium is confronted with XY chromosomes, they will differentiate into sertoli cells, which subsequently produce antimüllerian hormone, leading to the regression of the Müllerian duct. (wikipedia.org)
  • As the coelomic epithelium is confronted with XX chromosomes, the cells will differentiate into granulosa cells, which will not produce antimüllerian hormone and thus allow the development of the Müllerian duct. (wikipedia.org)
  • Hence, it appears as though several layers of cells are present and the epithelium is called pseudostratified. (wikipedia.org)
  • The pigmented layer of retina or retinal pigment epithelium (RPE) is the pigmented cell layer just outside the neurosensory retina that nourishes retinal visual cells, and is firmly attached to the underlying choroid and overlying retinal visual cells. (wikipedia.org)
  • superficial
  • Even non-keratinized surfaces, consisting as they do of keratinocytes, have a minor superficial keratinized layer of varying thickness, depending on the age of the epithelium and the damage it has experienced. (wikipedia.org)
  • The superficial cell layer, that which lines the lumen, is the only fully differentiated layer of the epithelium. (wikipedia.org)
  • embryonic
  • Here, however, we show that purely physical mechanisms can drive spatial patterning within embryonic epithelia. (pnas.org)
  • type
  • this is due to the convention of naming epithelia according to the cell type at the surface. (wikipedia.org)
  • This type of epithelium is well suited to areas in the body subject to constant abrasion, as the thickest layers can be sequentially sloughed off and replaced before the basement membrane is exposed. (wikipedia.org)