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Non-keratinized surfaces must be kept moist by bodily secretions to prevent them from drying out. Cells of stratum corneum are sometimes without keratin and living. Examples of non-keratinized stratified squamous epithelium include some parts of the lining of oral cavity , pharynx , conjunctiva of eye , upper one-third esophagus , rectum ...
Eventually the nucleus and cytoplasmic organelles disappear, metabolism ceases and cells undergo a programmed death as they become fully keratinized. In many other cell types, such as cells of the dermis, keratin filaments and other intermediate filaments function as part of the cytoskeleton to mechanically stabilize the cell against physical ...
Because of the differences between mucous membranes and the skin (e.g., keratinizing mucosa does not have a stratum lucidum and non keratinizing mucosa does not have this layer or normally a stratum corneum or a stratum granulosum), sometimes specialized texts give slightly different definitions of hyperkeratosis in the context of mucosae.
Non-keratinized squamous epithelia, except cornea [6] Cytokeratin 14: Basal layer of stratified and combined epithelia [6] Cytokeratin 18: Glandular epithelia of the digestive, respiratory, and urogenital tracts, both endocrine and exocrine cells, as well as mesothelial cells; Adenocarcinomas originating from those above [6] Cytokeratin 19
Cutaneous T cell lymphoma and non-Hodgkin's lymphoma may include skin sloughing as a side effect. Cutaneous T cell lymphoma is a varying category of cancers in the lymph system. The effects of these lymphomas on the skin typically progress with the disease. It is most common to experience patches or plaques on the skin.
The predominant cell keratinocyte, which produces keratin, a fibrous protein that aids in skin protection, is responsible for the formation of the epidermal water barrier by making and secreting lipids. [6] The majority of the skin on the human body is keratinized, with the exception of the lining of mucous membranes, such as the inside of the ...
Alpha-keratin, or α-keratin, is a type of keratin found in mammalian vertebrates.This protein is the primary component in hairs, horns, claws, nails and the epidermis layer of the skin. α-keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure.
Within the epidermis keratinocytes are associated with other cell types such as melanocytes and Langerhans cells. Keratinocytes form tight junctions with the nerves of the skin and hold the Langerhans cells and intra-dermal lymphocytes in position within the epidermis.
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