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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 month, whereas toenails grow about half as fast (approx. average 1.6 mm (0.063 in) a month). [11]
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).
Chimpanzees have lower limbs that are specialized for manipulation, and (arguably) have fingers (instead of toes) on their lower limbs as well. In the case of primates in general, the digits of the hand are overwhelmingly referred to as "fingers". [5] [6] Primate fingers have both fingernails and fingerprints. [7]
There are a few reasons why nails could be thin, brittle, and rough on the surface. Brittle nails are sometimes a symptom of metabolic conditions, such as thyroid disease and iron deficiency anemia .
“A lot of people always ask me how I do gymnastics with such long nails. To tell you the truth, they actually help me with my technique,” Chiles, 23, recently told the Associated Press .
Nail biting may have an association with oral problems, such as gingival injury, and malocclusion of the anterior teeth. [2] [6] It can also transfer pinworms or bacteria buried under the surface of the nail from the anus region to the mouth. [2] If the bitten-off nails are swallowed, stomach problems can occasionally develop. [6]
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 ...
2. You buffed your nails too much. Just as moisture-laden nails can be prone to peeling and splitting, so can nails that are dried out from too much buffing, according to Dr. Peters.