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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).
Half and half nails (also known as "Lindsay's nails") show the proximal portion of the nail white and the distal half red, pink, or brown, with a sharp line of demarcation between the two halves. [ 1 ] : 785 The darker distal discoloration does not fade on pressure, [ 2 ] which differentiates Lindsay's nails from Terry's nails .
The lunula can best be seen in the thumb and may not be visible in the little finger. The lunula appears white due to a reflection of light at the point where the nail matrix and nail bed meet. The nail bed is the skin beneath the nail plate. It is the area of the nail on which the nail plate rests.
Terry's nails is a physical condition in which a person's fingernails or toenails [1]: 659 appear white with a characteristic "ground glass" appearance without any lunula. [2]
12. Consider taking biotin supplements. While biotin supplements haven’t been proven to aid in hair and nail growth, there are anecdotal reports that they may help to strengthen the nail plate ...
Increased arteriolar blood flow, the vasodilatory capacitance phenomenon, and modifications to the optical characteristics of the nail plate overlaying the blood vessel, which accentuates the normal blood vessels, have all been proposed as possible causes of the red lunula. [4] [5]
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Onychorrhexis also known as brittle nails, is brittleness with breakage of fingernails or toenails. Paronychia is a bacterial or fungal infection where the nail and skin meet. Koilonychia is when the nail curves upwards (becomes spoon-shaped) due to an iron deficiency. The normal process of change is: brittle nails, straight nails, spoon-shaped ...