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| Normal hair |
| Etiology •N/A |
| Pathogenesis •N/A, |
| Epidemiology •N/A |
| General Gross Description •The entire surface of the body is covered with hair, with the exception of the palms and soles, the sides of the feet, the inner surfaces of the labia and the glans penis and the inner surface of the prepuce. •Most of the hairs are short and colorless and barely visible. •Hair over the scalp can be > 1 meter long. |
| General Microscopic Description •A normal hair is composed of a shaft and hair bulb. •The bulb is composed of a dermal papilla covered by a single layer of basal cells that generates the hair shaft. •The center most cells are the basal layer covering the dermal papilla which give rise to the medulla of the hair. • Cells immediately surrounding this give rise to the cortex •Further to the periphery, are the cells give rise to the hard cuticle of the hair. •In addition, the hair shaft has a internal root sheath and an external root sheath. |
| Clinical Correlation •N/A |
| References Bloom and Fawcett: A textbook of Histology. 12th Edition. New York: Chapman & Hall. 1994. pp 540 |
| Normal hair |
| Synopsis by: T.V.Rajan, M.D., Ph.D. (T01400M00100)[572] |
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