In
human anatomy
Human anatomy (gr. ἀνατομία, "dissection", from ἀνά, "up", and τέμνειν, "cut") is primarily the scientific study of the morphology of the human body. Anatomy is subdivided into gross anatomy and microscopic anatomy. Gross ...
, the eponychium is the thickened layer of
skin
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 ...
at the base of the
fingernails and toenails. It can also be called the medial or proximal nail fold. Its function is to protect the area between the nail and
epidermis
The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and Subcutaneous tissue, hypodermis. The epidermal layer provides a barrier to infection from environmental pathogens and regulates the ...
from exposure to bacteria. The vascularization pattern is similar to that of
perionychium.
The eponychium differs from the
cuticle
A cuticle (), or cuticula, is any of a variety of tough but flexible, non-mineral outer coverings of an organism, or parts of an organism, that provide protection. Various types of "cuticle" are non- homologous, differing in their origin, structu ...
– the eponychium is made up of live skin cells whilst the cuticle is dead skin cells.
In
hoofed animals, the eponychium is the
deciduous hoof capsule in
fetus
A fetus or foetus (; : fetuses, foetuses, rarely feti or foeti) is the unborn offspring of a viviparous animal that develops from an embryo. Following the embryonic development, embryonic stage, the fetal stage of development takes place. Pren ...
es and newborn
foal
A foal is an equine up to one year old; this term is used mainly for horses, but can be used for donkeys. More specific terms are colt (horse), colt for a male foal and filly for a female foal, and are used until the horse is three or four. Whe ...
s, and is a part of the permanent hoof in older animals.
The word ''eponychium'' comes .
See also
*
Hyponychium
*
Lunula
References
Nail anatomy
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