Skin

cutaneousskin cellanimal skinskin cellsskinssubcutaneous skin contactcutaneous constrictioncutaneous foldsCutaneous structure development
Skin is the soft outer tissue covering of vertebrates with three main functions: protection, regulation, and sensation.wikipedia
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Integumentary system

integumentaryintegumenttegument
In mammals, the skin is an organ of the integumentary system made up of multiple layers of ectodermal tissue, and guards the underlying muscles, bones, ligaments and internal organs.
The integumentary system comprises the skin and its appendages acting to protect the body from various kinds of damage, such as loss of water or damages from outside.

Scar

scarringscar tissuescars
Severely damaged skin may heal by forming scar tissue.
A scar is an area of fibrous tissue that replaces normal skin after an injury.

Keratin

keratinizationkeratinouskeratinized
Reptiles and fish have hard protective scales on their skin for protection, and birds have hard feathers, all made of tough β-keratins.
It is the key structural material making up hair, nails, feathers, horns, claws, hooves, calluses, and the outer layer of skin among vertebrates.

Epidermis

epidermalepidermal cellsepidermal layer
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.
The epidermis is the outermost of the three layers that make up the skin, the inner layers being the dermis and hypodermis.

Keratinocyte

keratinocytesskin cellsdead skin cells
It forms a protective barrier over the body's surface, responsible for keeping water in the body and preventing pathogens from entering, and is a stratified squamous epithelium, composed of proliferating basal and differentiated suprabasal keratinocytes.
Keratinocytes constitute 90% of the cells of the epidermis, the outermost layer of the skin.

Epithelium

epithelialepithelial cellsepithelial cell
It forms a protective barrier over the body's surface, responsible for keeping water in the body and preventing pathogens from entering, and is a stratified squamous epithelium, composed of proliferating basal and differentiated suprabasal keratinocytes.
An example is the epidermis, the outermost layer of the skin.

Tissue (biology)

tissuetissuesbiological tissue
In mammals, the skin is an organ of the integumentary system made up of multiple layers of ectodermal tissue, and guards the underlying muscles, bones, ligaments and internal organs.
This tissue covers all organismal surfaces that come in contact with the external environment such as the skin, the airways, and the digestive tract.

Langerhans cell

Langerhans cellsLangerhansLangerhans' cells
Langerhans cells are tissue-resident macrophages of the skin, and contain organelles called Birbeck granules.

Desquamation

skin peelingdesquamateddesquamating
Desquamation, commonly called skin peeling, is the shedding of the outermost membrane or layer of a tissue, such as the skin.

Organ (anatomy)

organorgansviscera
In mammals, the skin is an organ of the integumentary system made up of multiple layers of ectodermal tissue, and guards the underlying muscles, bones, ligaments and internal organs.

Frog

frogsAnuraanuran
For example, a frog sitting in an anesthetic solution would be sedated quickly, as the chemical diffuses through its skin.
It has many glands, particularly on the head and back, which often exude distasteful and toxic substances (granular glands).

Sweat gland

sweat glandsporesweat
It also contains the hair follicles, sweat glands, sebaceous glands, apocrine glands, lymphatic vessels and blood vessels.

Hair follicle

hair folliclesfolliclefollicles
It also contains the hair follicles, sweat glands, sebaceous glands, apocrine glands, lymphatic vessels and blood vessels. The disinfected skin surface gets recolonized from bacteria residing in the deeper areas of the hair follicle, gut and urogenital openings.
It resides in the dermal layer of the skin and is made up of 20 different cell types, each with distinct functions.

Collagen

procollagencollagenscollagen fibers
The dermis provides tensile strength and elasticity to the skin through an extracellular matrix composed of collagen fibrils, microfibrils, and elastic fibers, embedded in hyaluronan and proteoglycans.
It is mostly found in fibrous tissues such as tendons, ligaments, and skin.

Nociceptor

nociceptorspain receptornociceptive
It harbors many mechanoreceptors (nerve endings) that provide the sense of touch and heat through nociceptors and thermoreceptors.
External nociceptors are found in tissue such as the skin (cutaneous nociceptors), the corneas, and the mucosa.

Staphylococcus

staphylococcistaphylococcalstaph
Microorganisms like Staphylococcus epidermidis colonize the skin surface.
Most are harmless and reside normally on the skin and mucous membranes of humans and other organisms.

Fish scale

dermal denticlescalesctenoid
Cartilaginous fish have numerous tooth-like denticles embedded in their skin, in place of true scales.
A fish scale is a small rigid plate that grows out of the skin of a fish.

Extracellular matrix

ECMmatrixextracellular matrices
The dermis provides tensile strength and elasticity to the skin through an extracellular matrix composed of collagen fibrils, microfibrils, and elastic fibers, embedded in hyaluronan and proteoglycans.
This is useful in blood vessels, the lungs, in skin, and the ligamentum nuchae, and these tissues contain high amounts of elastins.

Bacteria

bacteriumbacterialEubacteria
The disinfected skin surface gets recolonized from bacteria residing in the deeper areas of the hair follicle, gut and urogenital openings.
The largest number exist in the gut flora, and a large number on the skin.

Estrogen

oestrogenestrogensestrogenic
The speed and quality of wound healing in skin is promoted by the reception of estrogen.
Some estrogens are also produced in smaller amounts by other tissues such as the liver, pancreas, bone, adrenal glands, skin, brain, adipose tissue, and the breasts.

Elastic fiber

elastic fiberselastic tissueelastic
The dermis provides tensile strength and elasticity to the skin through an extracellular matrix composed of collagen fibrils, microfibrils, and elastic fibers, embedded in hyaluronan and proteoglycans.
Elastic fibers are found in the skin, lungs, arteries, veins, connective tissue proper, elastic cartilage, periodontal ligament, fetal tissue and other structures.

Scale (anatomy)

scalesscalescaly
Cartilaginous fish have numerous tooth-like denticles embedded in their skin, in place of true scales. Instead, in most species, it is largely replaced by solid, protective bony scales.
In most biological nomenclature, a scale (Greek λεπίς, Latin squama) is a small rigid plate that grows out of an animal's skin to provide protection.

Cell (biology)

cellcellscellular
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.
In mammals, major cell types include skin cells, muscle cells, neurons, blood cells, fibroblasts, stem cells, and others.

Integument

skinepispermintegumentary
Both of these glands are part of the integument and thus considered cutaneous.
In biology, integument is the natural covering of an organism or an organ, such as its skin, husk, shell, or rind.

Cell junction

intercellular junctionsjunctional complexcell junctions
Retinal and skin cells are also dependent on gap junctions in cell differentiation and proliferation.