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supernumerary nails of the fingers and toes: Polyonychia from congenital polysyndactyly: Specialty: Medical genetics: Symptoms: Having two or more finger/toenails on a single digit: Complications: Social insecurity: Usual onset: Birth (congenital), post-traumatic (acquired) Duration: Life-long (unless it's corrected) Treatment: Plastic surgery ...
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.
While Beau's lines are actual ridges and indentations in the nail plate, Muehrcke lines are areas of hypopigmentation without palpable ridges; they affect the underlying nail bed, and not the nail itself. Beau's lines should also be distinguished from Mees' lines of the fingernails, which are areas of discoloration in the nail plate.
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In mammals, the growth rate of nails is related to the length of the terminal phalanges (outermost finger bones). Thus, in humans, the nail of the index finger grows faster than that of the little finger; and fingernails grow up to four times faster than toenails. [10] In humans, fingernails grow at an average rate of approx. 3.5 mm (0.14 in) a ...
Topical administration of urea cream 40% under occlusion [16] or halcinonide cream 0.1% under occlusion for 5–6 days [17] has been used to treat onychomadesis in certain patients, although these therapies have not always proven successful. [6] It has been suggested to apply basic fibroblast growth factor externally to promote fresh nail plate ...
Some women naturally have more sensitive DHT receptors, meaning that even normal hormone levels may stimulate increased facial hair growth. According to Dorr, that’s due to genetics and nothing ...
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).