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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).
Melanonychia is a black or brown pigmentation of a nail, and may be present as a normal finding on many digits in Afro-Caribbeans, as a result of trauma, systemic disease, or medications, or as a postinflammatory event from such localized events as lichen planus or fixed drug eruption.
The nail is an unguis, meaning a keratin structure at the end of a digit. Other examples of ungues include the claw, hoof, and talon. The nails of primates and the hooves of running mammals evolved from the claws of earlier animals. [38] In contrast to nails, claws are typically curved ventrally (downwards in animals) and compressed sideways.
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 ...
“Just as you would hydrate and care for damaged, dyed hair with conditioners, nails also need tender loving care,” says Dr. Kim. Keep cuticles moisturized, avoid biting or picking nails and ...
Also known as "true" leukonychia, this is the most common form of leukonychia, in which small white spots appear on the nails. Picking and biting of the nails are a prominent cause in young children and nail biters. Besides parakeratosis, air that is trapped between the cells may also cause this appearance. [5] It is also caused by trauma.
Acrylics may create inflamed or itchy cuticles if the tools used to apply them are worn out or coarse. Be mindful of those which have sharp odors -- this is a sign that something is off ...
The condition is thought to be due to a decrease in vascularity and an increase in connective tissue within the nail bed; [3] the darker shade of the distal portion of the nail fades upon pressure, which differentiates Terry's nails from Lindsay's nails.