Hair is an keratinized, epidermal, thread-like appendage which grows down into the dermis. It is found on most skin surfaces except:
In Man, hair has a role as a secondary sexual characteristic under the control of sex hormones e.g. in males, growth of facial terminal hairs at time of puberty and regression of hairline with age. The heat-insulating role of fur in lower animals has been lost in Man.
There are three types of hair:
Further, the amount and form of hair varies between races e.g. straight hair in Asians, relatively greater density of hair in those of Mediterranean extraction.
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