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Encyclopedia > Epidermis (skin)
Cross-section of all skin layers
Cross-section of all skin layers
Optical coherence tomography tomogram of fingertip, depicting stratum corneum (~500µm thick) with stratum disjunctum on top and stratum lucidum (connection to stratum spinosum) in the middle. At the bottom superficial parts of the dermis. Sweatducts are clearly visible.
Optical coherence tomography tomogram of fingertip, depicting stratum corneum (~500µm thick) with stratum disjunctum on top and stratum lucidum (connection to stratum spinosum) in the middle. At the bottom superficial parts of the dermis. Sweatducts are clearly visible.

Epidermis is the outermost layer of the skin. It forms the waterproof, protective wrap over the body's surface and is made up of stratified squamous epithelium with an underlying basal lamina. Image File history File linksMetadata Skin. ... Image File history File linksMetadata Skin. ... Image File history File links HautFingerspitzeOCT.gif‎ Optical Coherence Tomography tomogram of fingertip, depicting stratum corneum (~500µm thick) with stratum disjunctum on top and stratum lucidum (connection to stratum spinosum) in the middle. ... Image File history File links HautFingerspitzeOCT.gif‎ Optical Coherence Tomography tomogram of fingertip, depicting stratum corneum (~500µm thick) with stratum disjunctum on top and stratum lucidum (connection to stratum spinosum) in the middle. ... Optical coherence tomography tomogram of a fingertip. ... For other uses, see Skin (disambiguation). ... This article is about the epithelium as it relates to animal anatomy. ... The basal lamina (often erroneously called basement membrane) is a layer on which epithelium sits. ...

Contents

Components

The epidermis is avascular (contains no blood vessels) and is nourished by diffusion from the dermis. The main type or the four principal types of cells which make up the epidermis are keratinocytes, melanocytes, Langerhans cells and Merkels cells. It is a keratinized stratified squamous epithelium. f you all The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... diffusion (disambiguation). ... The dermis is a layer of skin beneath the epidermis that consists of connective tissue and cushions the body from stress and strain. ... The keratinocyte is the major cell type of the epidermis, making up about 90% of epidermal cells. ... This article or section does not cite its references or sources. ... Langerhans cells are immature dendritic cells containing large granules called Birbeck granules. ... Merkel cells are large oval cells found in the skin of vertebrates. ...


Layers

The epidermis is divided into many layers where cells are formed through mitosis at the innermost layers. They move up the strata changing shape and composition as they differentiate and become filled with keratin. They eventually reach the top layer called stratum corneum and become sloughed off, or desquamated. This process is called keratinization and takes place within weeks. The outermost layer of epidermis consists of 25 to 30 layers of dead cells. Mitosis divides genetic information during cell division. ... Not to be confused with kerogen or carotene. ...


Sublayers

Epidermis is divided into the following 5 sublayers or strata, listed from the superficial to deep:

It is the deepest layer of the skin specifically the epidermis. the anatomical structure of it is composed of a single row of cuboidal of columnar keratinocytes. The stratum corneum (the horny layer) is the outermost layer of the epidermis (the outermost layer of the skin). ... The Stratum Lucidum is one of the layers of the Epidermis. ... Stratum granulosum contains 3 to 5 rows of flattened cells whose cytoplasm contains small granules. ... It is a multiple-layered arrangement of cuboidal cells containing molecular bridges that conect them to adjacent cells. ... Stratum germinativum (also stratum basale or basal cell layer) is the layer of keratinocytes that lies at the base of the epidermis immediately above the dermis. ...


Mnemonics used for remembering the layers of the skin (using "stratum basale" instead of "stratum germinativum"): For other uses, see Mnemonic (disambiguation). ...

  • "Corn Lovers Grow Several Bales" (from superficial to deep)
  • "Come Lets Get Some Beers" (from superficial to deep)
  • "Before Signing, Get Legal Counsel" (from deep to superficial)
  • Californians Love Girls in String Bikinis C-L-G-S-B(from superficial to deep)

Additional images

External links

For the similarly named institution in Chestnut Hill, see Boston College. ... In zootomy, the integumentary system is the external covering of the body, comprising the skin, hair, scales, nails, sweat glands and their products (sweat and mucus). ... For other uses, see Skin (disambiguation). ... Cutis is the combined term for the epidermis and the dermis, the two outer layers of the skin. ... The stratum corneum (the horny layer) is the outermost layer of the epidermis (the outermost layer of the skin). ... The Stratum Lucidum is one of the layers of the Epidermis. ... Stratum granulosum contains 3 to 5 rows of flattened cells whose cytoplasm contains small granules. ... It is a multiple-layered arrangement of cuboidal cells containing molecular bridges that conect them to adjacent cells. ... Stratum germinativum (also stratum basale or basal cell layer) is the layer of keratinocytes that lies at the base of the epidermis immediately above the dermis. ... The dermis is a layer of skin beneath the epidermis that consists of connective tissue and cushions the body from stress and strain. ... The subcutis is the layer of tissue directly underlying the cutis. ... Skin appendages are appendages that are associated with the skin and serve a particular function. ... Human submaxillary gland. ... In humans, there are four kinds of sudoriferous or sweat glands which differ greatly in both the composition of the sweat and its purpose. ... A diagrammatic sectional view of the skin (magnified). ... A diagrammatic sectional view of the skin (magnified). ... Schematic view of a hair follicle with sebaceous gland. ... For the 1968 stage production, see Hair (musical), for the 1979 film, see Hair (film). ... The root of the hair ends in an enlargement, the hair bulb, which is whiter in color and softer in texture than the shaft, and is lodged in a follicular involution of the epidermis called the hair follicle. ... A hair follicle is part of the skin that grows hair by packing old cells together. ... The inner or epidermic coat of the hair follicle is closely adherent to the root of the hair, and consists of two strata named respectively the outer and inner root sheaths; The outer root sheath corresponds with the stratum mucosum of the epidermis, and resembles it in the rounded form... The second layer of the inner root sheath of the hair consists of one or two layers of horny, flattened, nucleated cells, known as Huxleys layer. ... Henles layer is the third layer of the inner root sheath of the hair, consisting of a single layer of cubical cells with clear flattened nuclei. ... For other uses, see Nail. ... The eponychium of a pinky, or little finger. ... The lunula is the crescent shaped whitish area of the nail bed of a fingernail or toenail. ... In this SEM image of a butterfly wing the scales are clearly visible, and the tiny platelets on each individual scale are just barely visible in the striping. ... Two feathers Feathers are one of the epidermal growths that form the distinctive outer covering, or plumage, on birds. ...

  Results from FactBites:
 
Epidermis definition - Skin Diseases, Conditions, Symptoms, and Procedures on MedicineNet.com (242 words)
Epidermis: The upper or outer layer of the two main layers of cells that make up the skin.
The epidermis is mostly made up of flat, scale-like cells called squamous cells.
The other main layer of the skin is the dermis, the inner layer of skin, that contains blood and lymph vessels, hair follicles, and glands.
SIU SOM Histology INTRO (0 words)
Variations in skin color in different parts of the body (see regional differences) are based on variations in these elements, most especially the amount of pigment, the thickness of dermis, and the degree of perfusion in dermal capillaries.
Texture: Skin texture is affected the thickness and smoothness of the epidermis, by the quality of fibers in the dermis, and by the amount of fluid in dermal connective tissue.
Because the epidermis is continually being replenished by cell divisions among basal keratinocytes and because this tissue is exposed to a variety of insults, the epidermis is especially prone to disturbances of growth.
  More results at FactBites »

 
 

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