Keratinocyte

(histology) A specialized epidermal cell that synthesizes keratin.

A cell of the living epidermis and certain oral epithelia that produces keratin in the process of differentiating into the dead and fully keratinized cells of the stratum corneum.

The cell of the epidermis that synthesizes keratin, known in its successive stages in the various layers of the skin as basal cell, prickle cell and granular cell.

• k. transit time — the time required for a keratinocyte to move from its origin in the actively dividing cells of the stratum basale to the surface of the epidermis where it is shed. Called also epidermal renewal time. In the normal dog, this is approximately 22 days.

The keratinocyte is the major constituent of the epidermis, constituting 95% of the cells found there.^[1] Those keratinocytes found in the stratum basale are sometimes referred to as "basal cells" or "basal keratinocytes."^[2]

Melanosomes are transferred to it by dendritic processes(Cytocrine melanin).

References

1. ^ McGrath, J.A.; Eady, R.A.; Pope, F.M. (2004). Rook's Textbook of Dermatology (Seventh Edition). Blackwell Publishing. Pages 3.7. ISBN 9780632064298.
2. ^ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. Pages 5-6. ISBN 0721629210.

v • d • e Integumentary system (TA A16, GA 10.1062) Skin Epidermis Stratum corneum · Stratum lucidum · Stratum granulosum · Stratum spinosum · Stratum germinativum (basale) Basement membrane zone Basal keratinocyte · Lamina lucida · Lamina densa Dermis Papillary · Reticular Subcutaneous tissue Panniculus adiposus · Panniculus carnosus · Stratum membranosum · Loose connective tissue · Superficial fascia Adnexa Glands Sweat glands: Apocrine · Eccrine Sebaceous Hair Outer root sheath Inner root sheath Shaft Cuticle · Cortex · Medulla · Bulb with matrix cells · Hair papilla Muscle Arrector pili Nail Matrix · Lunula · Nail plate · Eponychium · Paronychium · Hyponychium Other Skin flora integument, SF, LCT navs: anat/physio, noncongen/congen/neoplasia, symptoms+signs/eponymous, proc skin appendage navs: anat, noncongen/congen/neoplasia, symptoms+signs/eponymous, proc

v • d • e Human cell types Blood/immune lymphoid: B cell  · T cell (Cytotoxic T cell, Natural Killer T cell, Regulatory T cell, T helper cell) · Natural killer cell myeloid: granulocytes (Basophil granulocyte, Eosinophil granulocyte, Neutrophil granulocyte/Hypersegmented neutrophil)  · Monocyte/Macrophage  · Red blood cell (Reticulocyte)  · Mast cell  · Thrombocyte/Megakaryocyte  · Dendritic cell Endocrine system thyroid (Thyroid epithelial cell, Parafollicular cell)  · parathyroid (Parathyroid chief cell, Oxyphil cell)  · adrenal (Chromaffin cell) · pineal (Pinealocyte) Nervous system glial cells: Glioblast (Astrocyte, Oligodendrocyte) · Microglia Magnocellular neurosecretory cell  · Stellate cell · Boettcher cell pituitary (Gonadotrope, Corticotrope, Thyrotrope, Somatotrope, Lactotroph ) Respiratory system Pneumocyte (Type I pneumocyte, Type II pneumocyte) · Clara cell · Goblet cell · Alveolar macrophage Circulatory system Myocardiocyte · Pericyte Digestive system stomach (Gastric chief cell, Parietal cell) · Goblet cell · Paneth cell G cells · D cells · ECL cells · I cells  · K cells  · S cells Enteroendocrine cells · Enterochromaffin cell · APUD cell liver (Hepatocyte, Kupffer cell) Cartilage/bone/ muscle/ integumentary system bone: Osteoblast · Osteocyte · Osteoclast · teeth (Cementoblast, Ameloblast) cartilage: Chondroblast · Chondrocyte skin/hair: Trichocyte · Keratinocyte  · Melanocyte (Nevus cell) muscle: Myocyte other: Adipocyte  · Fibroblast · Tendon cell Urinary system Podocyte  · Juxtaglomerular cell  · Intraglomerular mesangial cell/Extraglomerular mesangial cell  · Kidney proximal tubule brush border cell  · Macula densa cell Reproductive system male (Spermatozoon, Sertoli cell, Leydig cell)  · female (Ovum) see also list of distinct cell types in the adult human body

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