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In humans, fingernails grow at an average rate of approx. 3.5 mm (0.14 in) a month, whereas toenails grow about half as fast (approx. average 1.6 mm (0.063 in) a month). [11] Fingernails require three to six months to regrow completely, and toenails require twelve to eighteen months.
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.
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Sample growth chart for use with American boys from birth to age 36 months. A growth chart is used by pediatricians and other health care providers to follow a child's growth over time. Growth charts have been constructed by observing the growth of large numbers of healthy children over time.
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).
1 cm – approximate width of average fingernail; 1.2 cm – length of a bee; 1.2 cm – diameter of a die; 1.5 cm – length of a very large mosquito; 1.6 cm – length of a Jaragua Sphaero, a very small reptile; 1.7 cm – length of a Thorius arboreus, the smallest salamander [112] 2 cm – approximate width of an adult human finger; 2.54 cm ...
Chevron nail, also known as a herringbone nail, is a rare transient fingernail ridge pattern seen in children, a ridge arising from the proximal nailfold and converging in a V-shaped pattern towards the midpoint distally. [1]: 786 The nail growth pattern has no known association with medical problems and tends to resolve by early adulthood. [2]
Koilonychia, also known as spoon nails, [1]: 782 is a nail disease that can be a sign of hypochromic anemia, especially iron-deficiency anemia. [2]: 656 [3] It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape. In a sense, koilonychia is the opposite of nail clubbing ...