Search results
Results from the WOW.Com Content Network
Microscopy of keratin filaments inside cells. Keratin (/ ˈ k ɛr ə t ɪ n / [1] [2]) is one of a family of structural fibrous proteins also known as scleroproteins.It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, and the outer layer of skin in vertebrates.
Hyperkeratinization (American English or hyperkeratinisation in British) is a disorder of the cells lining the inside of a hair follicle.It is the normal function of these cells to detach or slough off from the skin lining at normal intervals.
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.
The primary function of keratinocytes is the formation of a barrier against environmental damage by heat, UV radiation, dehydration, pathogenic bacteria, fungi, parasites, and viruses.
large-cell keratinizing squamous-cell carcinoma (code 8071/3) large-cell nonkeratinizing squamous-cell carcinoma (code 8072/3) small-cell keratinizing squamous-cell carcinoma (code 8073/3) spindle-cell squamous-cell carcinoma (code 8074/3) It is also known as spindle-cell carcinoma, [23] and is a subtype characterized by spindle-shaped atypical ...
A stratified squamous epithelium consists of squamous (flattened) epithelial cells arranged in layers upon a basal membrane.Only one layer is in contact with the basement membrane; the other layers adhere to one another to maintain structural integrity.
Early actinic keratosis with parakeratosis, with black arrows indicating one of multiple retained nuclei in the stratum corneum. Parakeratosis is a mode of keratinization characterized by the retention of nuclei in the stratum corneum. [1]
Cholesteatoma is a destructive and expanding growth consisting of keratinizing squamous epithelium in the middle ear and/or mastoid process. [1] [2] Cholesteatomas are not cancerous as the name may suggest, but can cause significant problems because of their erosive and expansile properties.