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Delayed return to pink color can be an indicator of certain shock states such as hypovolemia.
Deep, horizontally transverse grooves known as "Beau's lines" may form across the nails (horizontal, not along the nail from cuticle to tip).
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 while the eponychium is the fold of skin cells that produces the cuticle.
The width and thickness of the nail plate is determined by the size, length, and thickness of the matrix, while the shape of the fingertip itself shows if the nail plate is flat, arched, or hooked.
It is not visible in some individuals while it is highly prominent on others.
A nail is a horn-like keratinous envelope covering the tips of the fingers and toes in most primates. Fingernails and toenails are made of a tough protective protein called alpha-keratin which is found in the hooves, hair, claws and horns of vertebrates.
The matrix produces cells that become the nail plate.
Fingernails require three to six months to regrow completely, and toenails require twelve to eighteen months.
Actual growth rate is dependent upon age, sex, season, exercise level, diet, and hereditary factors.