Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation.. 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'). Fingerprints are used as a means of personal identification because they have a high relief, more evident patternings, and can be easily obtained. A soft, absorbent piece of paper used as toilet paper, a handkerchief, or a towel. We use cookies to enhance your experience on our website, including to provide targeted advertising and track usage. Skin definition is - the integument of an animal (such as a fur-bearing mammal or a bird) separated from the body usually with its hair or feathers. Define skin. Human skin, whose cells are generated continuously by the body, serves as a protective barrier between the inside of the human body and the environment. Subcutaneous tissue, which is also known as the hypodermis, is the innermost layer of skin.It's made up of fat and connective tissues that house larger blood vessels and nerves, and it acts as an insulator to help regulate body temperature. WebMD's Skin Anatomy Page provides a detailed image of the skin and its parts as well as a medical definition. The mammalian epidermis always possesses at least a stratum germinativum and stratum corneum, but the other intermediate layers found in humans are not always distinguishable. For example, muscle tissue is a group of muscle cells. There are four different types of tissues in animals: connective, muscle, nervous, and epithelial. The dermis of bony fish typically contains relatively little of the connective tissue found in tetrapods. The basal layer is a stem cell layer and through asymmetrical divisions, becomes the source of skin cells throughout life. Because breast density appears white on a mammogram as well as cancer, this dense breast tissue can mask the detection of any cancer. (skĭn) The outer covering of a vertebrate animal, consisting of two layers of cells, a thick inner layer (called the dermis) and a thin outer layer (called the epidermis). Its purpose is to attach the skin to underlying bone and muscle as well as supplying it with blood vessels and nerves. However, when the ducts become mature and full of fluid, the base of the ducts become swollen due to the pressure from the inside. Corrections? In the skin of mice, mitochondrial oxidative stress can promote cellular senescence and aging phenotypes. To aid in this function, sweat glands pour water upon its surface, the evaporation of which absorbs heat from the skin. Tissue definition is - a piece of soft absorbent tissue paper used especially as a handkerchief or for removing cosmetics. 1. uncountable the substance that animal and plant cells are made of. The characteristic features of skin change from the time of birth to old age. Squamous cell carcinoma of the skin is a common form of skin cancer that develops in the squamous cells that make up the middle and outer layers of the skin. Amphibian skin plays key roles in everyday survival and their ability to exploit a wide range of habitats and ecological conditions.[9]. A network of extendable elastic fibres keeps the skin taut and restores it after it has been stretched. Keratinocytes in the stratum basale proliferate through mitosis and the daughter cells move up the strata changing shape and composition as they undergo multiple stages of cell differentiation to eventually become anucleated. Skin from sheep, goat and cattle was used to make parchment for manuscripts. You should protect your skin from the sun. Adipose tissue is distributed within two compartments of the human body: Parietal or subcutaneous fat, which is embedded in the connective tissue under the skin ; Visceral fat, which surrounds the internal organs, such as eyeballs (periorbital fat) or kidneys (perirenal fat capsule). Certain occupations leave skin marks that, depending upon duration and severity, may be transient or permanent. How to use friable in a sentence. During that process, keratinocytes will become highly organized, forming cellular junctions (desmosomes) between each other and secreting keratin proteins and lipids which contribute to the formation of an extracellular matrix and provide mechanical strength to the skin. Thin skin is sometimes called thinning skin, or fragile skin. Many species, such as chameleons and flounders may be able to change the color of their skin by adjusting the relative size of their chromatophores. 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