Epidermis

epidermalepidermal cellsepidermal layerrete ridgeskinepidermal cellEpidermis (skin)epidermal tissuebasal celldermal
The epidermis is the outermost of the three layers that make up the skin, the inner layers being the dermis and hypodermis.wikipedia
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Keratinocyte

keratinocytesskin cellsdead skin cells
The epidermis primarily consists of keratinocytes (proliferating basal and differentiated suprabasal), which comprise 90% of its cells, but also contains melanocytes, Langerhans cells, Merkel cells, and inflammatory cells.
Keratinocytes constitute 90% of the cells of the epidermis, the outermost layer of the skin.

Epithelium

epithelialepithelial cellsepithelial cell
The epidermis is composed of multiple layers of flattened cells that overlie a base layer (stratum basale) composed of columnar cells arranged perpendicularly.
An example is the epidermis, the outermost layer of the skin.

Skin

cutaneousskin cellanimal skin
The epidermis is the outermost of the three layers that make up the skin, the inner layers being the dermis and hypodermis.
The epidermis contains no blood vessels, and cells in the deepest layers are nourished by diffusion from blood capillaries extending to the upper layers of the dermis.

Transepidermal water loss

transepidermalunavoidable water loss through the skinwater loss
The epidermis layer provides a barrier to infection from environmental pathogens and regulates the amount of water released from the body into the atmosphere through transepidermal water loss.
Transepidermal water loss (TEWL or TWL) is the loss of water that passes from inside a body (animal or plant) through the epidermis (that is, either the epidermal layer of animal skin or the epidermal layer of plants) to the surrounding atmosphere via diffusion and evaporation processes.

Melanocyte

melanocytesmelanogenesismelanocytic
The epidermis primarily consists of keratinocytes (proliferating basal and differentiated suprabasal), which comprise 90% of its cells, but also contains melanocytes, Langerhans cells, Merkel cells, and inflammatory cells.
Melanocytes are melanin-producing neural crest-derived cells located in the bottom layer (the stratum basale) of the skin's epidermis, the middle layer of the eye (the uvea), the inner ear, vaginal epithelium, meninges, bones, and heart.

Dermis

dermaldermal papillaepapillary dermis
The epidermis is the outermost of the three layers that make up the skin, the inner layers being the dermis and hypodermis. Epidermal thickenings called Rete ridges (or rete pegs) extend downward between dermal papillae.
The dermis or corium is a layer of skin between the epidermis (with which it makes up the cutis) and subcutaneous tissues, that primarily consists of dense irregular connective tissue and cushions the body from stress and strain.

Rete pegs

rete ridgesRete pegepidermal projections that interdigitate with dermis
Epidermal thickenings called Rete ridges (or rete pegs) extend downward between dermal papillae.
Rete pegs (also known as rete processes or rete ridges) are the epithelial extensions that project into the underlying connective tissue in both skin and mucous membranes.

Hemidesmosome

hemidesmosomeshemidesmosomaladhesion complexes
Hemidesmosomes are very small stud-like structures found in keratinocytes of the epidermis of skin that attach to the extracellular matrix.

Keratin

keratinizationkeratinouskeratinized
The cells in the stratum granulosum do not divide, but instead form skin cells called keratinocytes from the granules of keratin.
Keratin filaments are abundant in keratinocytes in the cornified layer of the epidermis; these are proteins which have undergone keratinization.

Corneocyte

corneocytescornified cell envelope
Corneocytes are terminally differentiated keratinocytes and compose most if not all of the stratum corneum, the outermost part of the epidermis.

Merkel cell

Merkel cellsMerkel cell-neurite complexesMerkel-Ranvier cell
The epidermis primarily consists of keratinocytes (proliferating basal and differentiated suprabasal), which comprise 90% of its cells, but also contains melanocytes, Langerhans cells, Merkel cells, and inflammatory cells.
In mammalian skin, they are clear cells found in the stratum basale (at the bottom of sweat duct ridges) of the epidermis approximately 10 μm in diameter.

Stratum granulosum

granular layerGranular layer of skingranulosum
The stratum granulosum (or granular layer) is a thin layer of cells in the epidermis.

Stratum basale

basal layerbasal cellsStratum germinativum
The epidermis is composed of multiple layers of flattened cells that overlie a base layer (stratum basale) composed of columnar cells arranged perpendicularly.
The stratum basale (basal layer, sometimes referred to as stratum germinativum) is the deepest layer of the five layers of the epidermis, the external covering of skin in mammals.

Stratum spinosum

prickle cell layerspinosumspinous layer
The Malpighian layer (stratum malpighi) is both the stratum basale and stratum spinosum.
The stratum spinosum (or spinous layer/prickle cell layer) is a layer of the epidermis found between the stratum granulosum and stratum basale.

Stratum corneum

horny layercornified layerepidermal permeability barrier
These skin cells finally become the cornified layer (stratum corneum), the outermost epidermal layer, where the cells become flattened sacks with their nuclei located at one end of the cell.
The stratum corneum (Latin for 'horny layer') is the outermost layer of the epidermis.

Desquamation

skin peelingdesquamateddesquamating
Differentiating cells delaminate from the basement membrane and are displaced outward through the epidermal layers, undergoing multiple stages of differentiation until, in the stratum corneum, losing their nucleus and fusing to squamous sheets, which are eventually shed from the surface (desquamation).
Desquamation of the epidermis may result from disease or injury of the skin.

Subcutaneous tissue

subcutaneoussubcutaneous fathypodermis
The epidermis is the outermost of the three layers that make up the skin, the inner layers being the dermis and hypodermis.

Lamellar bodies

Lamellar granulesextracellular lipid lamellaemultilamellar bodies
In the upper stratum spinosum and stratum granulosum layers of the epidermis, lamellar bodies are secreted from keratinocytes, resulting in the formation of an impermeable, lipid-containing membrane that serves as a water barrier and is required for correct skin barrier function.

Stratified squamous epithelium

stratified squamousstratified epitheliumstratified squamous epithelia
The epidermis is composed of multiple layers of flattened cells that overlie a base layer (stratum basale) composed of columnar cells arranged perpendicularly.

Langerhans cell

Langerhans cellsLangerhansLangerhans' cells
The epidermis primarily consists of keratinocytes (proliferating basal and differentiated suprabasal), which comprise 90% of its cells, but also contains melanocytes, Langerhans cells, Merkel cells, and inflammatory cells.

Ceramide

ceramidesN-acylsphingosineCer
Ceramide is the main component of the stratum corneum of the epidermis layer of human skin.

Malpighian layer

Malpighi layerstratum malphigii
The Malpighian layer (stratum malpighi) is both the stratum basale and stratum spinosum.
* Epidermis

Melanin

eumelaninpheomelaninphaeomelanin
The amount and distribution of melanin pigment in the epidermis is the main reason for variation in skin color in Homo sapiens.
The melanin in the skin is produced by melanocytes, which are found in the basal layer of the epidermis.

Skin repair

* Skin repair
Protection from mechanical injury, chemical hazards, and bacterial invasion is provided by the skin because the epidermis is relatively thick and covered with keratin.

Germ layer

germ layersmesodermectoderm
This inner layer is a germinal epithelium that gives rise to all epidermal cells.
The surface ectoderm develops into: epidermis, hair, nails, lens of the eye, sebaceous glands, cornea, tooth enamel, the epithelium of the mouth and nose.