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The integumentary system includes skin, hair, scales, feathers, hooves, and nails. It has a variety of additional functions: it may serve to maintain water balance, protect the deeper tissues, excrete wastes, and regulate body temperature, and is the attachment site for sensory receptors which detect pain, sensation, pressure, and temperature.
A nail is a protective plate characteristically found at the tip of the digits ( fingers and toes) of all primates, corresponding to the claws in other tetrapod animals. Fingernails and toenails are made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves and horns of vertebrates.
The lunula is the white crescent-shaped area at the base of a nail. The lunula, or ( pl.: lunulae; from Latin 'little moon'), is the crescent-shaped whitish area of the bed of a fingernail or toenail . In humans, it appears by week 14 [1] of gestation, and has a primary structural role in defining the free edge of the distal nail plate (the ...
Given that the Dazzle Dry nail polish delivers on its promises to be quick-drying and long-lasting, shoppers on Amazon are raving about it. “Best nail polish ever,” commented one shopper ...
Pterygium unguis. Pterygium unguis (or dorsal pterygium [1] : 660 ) forms as a result of scarring between the proximal nailfold and matrix, with the classic example being lichen planus, though it has been reported to occur as a result of sarcoidosis and Hansen's disease. [2]
They are typically white bands traversing the width of the nail. As the nail grows they move towards the end, and finally disappear when trimmed. Causes. Mees' lines appear after an episode of poisoning with arsenic, thallium or other heavy metals or selenium, opioid MT-45, and can also appear if the subject is suffering from kidney failure.
Human anatomy Anatomy of the basic parts of a human nail. In human anatomy, "cuticle" can refer to several structures, but it is used in general parlance, and even by medical professionals, to refer to the thickened layer of skin surrounding fingernails and toenails (the eponychium), and to refer to the superficial layer of overlapping cells covering the hair shaft (cuticula pili), consisting ...
Hair exists in a variety of textures. Three main aspects of hair texture are the curl pattern, volume, and consistency. All mammalian hair is composed of keratin, so the make-up of hair follicles is not the source of varying hair patterns. There are a range of theories pertaining to the curl patterns of hair.