الفهرس 
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Abstract
Human hair is one of the most available human tissues, as such, it has been used for clinical and experimental study by many authors (Porter and Lobitz, 1970; Muller, 1973 and Price, 1975), particularly in genetics, it is well documented that human hair will be one of the most important phenotypes of certain disorders.
The attenion of pediatricians and dermatologists have been directed towards the study of hair as a mean of assessing the nutritional, mental and neurological state of children.
The structural hair—shaft anomalies are an important group of disorders, which may, in some instances, provide a clue to a widespread pathology such as an inborn error of metabolism. Each anomaly has a highly distinctive mor- phology (Price, 1978).
Abnormalities of the hair shaft are varied and often confusing. They do require accurate recognition, which can be helpful in the diagnosis and management of a hair disorder, or in the detection of underlying disease. A reliable evaluation of hair shaft abnormality is dependent on familiarity with the vast structural variations in normal hair. These structural abnormalities can be congenital or acquired, and some are associated with hair fragility (Whiting, 1987).