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Human nails grow at a rate which varies with many factors: age, the specific digit, as well as nutrition. However, typically in healthy populations fingernails grow at about 0.1 mm/day and toenails at about 0.05 mm/day. [10]
The signs/symptoms of polyonychia are very easy to detect: two or more nails growing on the same finger or toe. The nails can either be separate, small nails (micronychia) or one wide, almost complete nail, the digit affected could also be wider than normal
The cause is poorly understood due to a lack of research, but genome-wide scans indicate that it is a heritable trait, and could be autosomal dominant. [4] However, the wide variance in the size and structure of the accessory nail indicates that the trait may not follow a Mendelian pattern of inheritance, and may instead be a complex trait affected by multiple genes with minor genetic effects.
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.
Onychomadesis is a periodic idiopathic shedding of the nails beginning at the proximal end, possibly caused by the temporary arrest of the function of the nail matrix. [1]: 784 [2]: 660 One cause in children is hand, foot, and mouth disease. [3] This generally resolves without complication.
Photo: Getty 1. The hard-to-clean area underneath your nail may cause your nails to be extra sensitive, especially if an MMA-based acrylic (Methyl Methacrylate) is used. Though they've been banned ...
Nail clubbing - nails that curve down around the fingertips with nailbeds that bulge is associated with oxygen deprivation and lung, heart, or liver disease. Koilonychia - spooning, or nails that grow upwards. Associated with iron-deficiency anaemia or vitamin B 12 deficiency. [citation needed] Pitting of the nails is associated with psoriasis.
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).