Thelda Kestenbaum,M.D.* Primary Nail Diseases
Nail. . Biting .iO.nychopha.gia)
Hangnails.. (Agnails) Ingrown.. Nails.iOnyc.ho.cryplos.is,)
Median. „N.ail.D.ys.trop.hy.lMedial. .Canaliform,..Dystrofi,hy) Habit.. jicDeformity
Nail. DiseaseSecondaryto. „Other ..,Dermat,os,e,s Onychomycosis
Eczematous.. .Eru.Btlons.Sf.. the.Nail. .Unit
Nail. DiseaseSecondaryto. .Internal ..Disease Beau'sLines
Clubbed. Nails... (HiPPficraticNails) Koilo.nychia. . (Spoon. . .Nails) Terry's.N.ails „a.nd.„H„a.|f-and:Hlalf .Nails Muehrcke's .Lines Syphilis
Acquired.. Immunodeficiency.. Syndrome
OtherConditions. o.U.he ..Nails DruaReactions
Onycholysis Yellow-Nail. Syndrome Pincer .Nails.. (Omega. .Nails) Bibliography
The most common nail dystrophies are caused by fungal infection, psoriasis, trauma, impaired circulation, and aging. Nail disease may be divided into (1) primary nail diseases, (2) nail dystrophies associated with cutaneous disease, and (3) nail dystrophies that reflect internal disease. There is considerable overlap between some of these categories.
Growth of fingernails is approximately 0.1 mm/day. Nails grow more rapidly on the middle finger than they do on the thumb or fifth finger. Toenails grow at one half or one third of the rate of fingernails. Diseases such as psoriasis or nail biting hasten nail growth. Old age and decreased circulation may slow nail growth.
Nail anatomy is discussed in Chap 1. The nail matrix is responsible primarily for the nail plate. Calcium only accounts for a small percent of the nail plate by weight, contrary to the opinon of many people.
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