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Together, the eponychium and the cuticle form a protective seal. The cuticle is the semi-circular layer of almost invisible dead skin cells that "ride out on" and cover the back of the visible nail plate. The eponychium is the fold of skin cells that produces the cuticle. They are continuous, and some references view them as one entity.
In human anatomy, the eponychium is the thickened layer of skin at the base of the fingernails and toenails. [1] It can also be called the medial or proximal nail fold. Its function is to protect the area between the nail and epidermis from exposure to bacteria. The vascularization pattern is similar to that of perionychium. [2]
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 of dead cells ...
Skin appendages (or adnexa of skin) are anatomical skin-associated structures that serve a particular function including sensation, contractility, lubrication and heat loss in animals.
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The lunula (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 part of the nail that grows outward).
In hoofed animals, the deciduous hoof capsule (Capsula ungulae decidua) is the eponychium in fetuses and newborn foals. [1] It is a deciduous structure, which disappears as the animal grows. In equines, they are shed soon after a foal begins to stand. [2] The shedding process can vary from dropping-off whole to the gradual wearing down of the ...
[3] [4] The keratinocytes of the stratum lucidum do not feature distinct boundaries and are filled with eleidin, an intermediate form of keratin. They are surrounded by an oily substance that is the result of the exocytosis of lamellar bodies accumulated while the keratinocytes are moving through the stratum spinosum and stratum granulosum.