What is skin?

Skin

Skin is the soft outer covering of vertebrates. Other animal coverings such as the arthropod exoskeleton have different developmental origin, structure and chemical composition. The adjective cutaneous means "of the skin" (from Latin cutis, skin). In mammals, the skin is the largest organ of the integumentary system made up of multiple layers of ectodermal tissue, and guards the underlying muscles, bones, ligaments and internal organs. Skin of a different nature exists in amphibians, reptiles, and birds. All mammals have some hair on their skin, even marine mammals which appear to be hairless. The skin is one of the most important parts of the body because it interfaces with the environment and is the first line of defense from external factors. For example, the skin plays a key role in protecting the body against pathogens and excessive water loss. Its other functions are insulation, temperature regulation, sensation, and the production of vitamin D folates. Severely damaged skin may heal by forming scar tissue. This is sometimes discoloured and depigmented. The thickness of skin also varies from location to location on an organism. In humans for example, the skin located under the eyes and around the eyelids is the thinnest skin in the body at 0.5 mm thick, and is one of the first areas to show signs of aging such as "crows feet" and wrinkles. The skin on the palms and the soles of the feet is 4 mm thick and the thickest skin in the body.

Read more about Skin.

Some articles on skin:

Urushiol-induced Contact Dermatitis - Rash
... Since the skin reaction is an allergic one, people may develop progressively stronger reactions after repeated exposures, or show no immune response on their first exposure, but show ... a trace of urushiol (two micrograms or less than one ten-millionth of an ounce) on the skin to initiate an allergic reaction (Epstein et al ... Severe cases will have small (1–2 mm) clear fluid-filled blisters on the skin ...
Goose Bumps - Cause - Extreme Temperatures
... muscles that are contracting are causing a "bunching" of the skin surrounding the hairs, which results in the "bumps" in goosebumps ... This is the body's way of preserving its own heat by causing the hairs on the skin to stand up, thus reducing heat loss ... As the perspiration accumulates on the skin, it naturally evaporates ...
Eschar
... or piece of dead tissue that is cast off from the surface of the skin, particularly after a burn injury, but also seen in gangrene, ulcer, fungal infections, necrotizing ... if a skin graft is to be conducted) ... used in herbal medicine as topical treatments for localised skin cancers and can be effective in some cases, but often cause scarring and can potentially ...
Skin - Detailed Cross Section
... Look up skin in Wiktionary, the free dictionary. ...
Skin (computing)
... In computing, a skin is a custom graphical appearance achieved by the use of a graphical user interface (GUI) that can be applied to specific software and websites to suit the ... A skin may be associated with themes ... Software that is capable of having a skin applied is referred to as being skinnable, and the process of writing or applying such a skin is known as skinning ...

More definitions of "skin":

  • (verb): Strip the skin off.
    Synonyms: peel, pare
  • (noun): A natural protective covering of the body; site of the sense of touch.
    Example: "Your skin is the largest organ of your body"
    Synonyms: tegument, cutis
  • (noun): A bag serving as a container for liquids; it is made from the skin of an animal.
  • (noun): The rind of a fruit or vegetable.
    Synonyms: peel
  • (noun): An outer surface (usually thin).
    Example: "The skin of an airplane"
  • (verb): Remove the bark of a tree.
    Synonyms: bark
  • (verb): Bruise, cut, or injure the skin or the surface of.
    Synonyms: scrape
  • (noun): Body covering of a living animal.
    Synonyms: hide, pelt
  • (noun): A person's skin regarded as their life.
    Example: "He tried to save his skin"
  • (noun): The tissue forming the hard outer layer (of e.g. a fruit).
    Synonyms: rind, peel

Famous quotes containing the word skin:

    All we need is a meteorologist who has once been soaked to the skin without ill effect. No one can write knowingly of the weather who walks bent over on wet days.
    —E.B. (Elwyn Brooks)

    Her skin was white as leprosy,
    The nightmare Life-in-Death was she,
    Who thicks man’s blood with cold.
    Samuel Taylor Coleridge (1772–1834)

    I’ve been opened and undressed.
    I have no arms or legs.
    I’m all one skin like a fish.
    I’m no more a woman
    than Christ was a man.
    Anne Sexton (1928–1974)