Nail formation and some nail disorders
نویسنده
چکیده
Synopsis---The flat NAIL of some primates, including man, is unique and is usually formed from one area of the nail fold invagination called the MATRIX. This is deeply placed below two layers of EPIDERMIS and is therefore well protected from injury. Alternative .methods of nail formation more closely resemble the formation of a mammalian claw and may be regressions to a more primitive state. Conventional nail cosmetics are well tolerated but modifications to improve their stability or their ease of application have caused DAMAGE to nails on a number of occasions. The use of FORMALDEHYDE as a nail HARDENER has also caused trouble and should be
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