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The hair is produced by a peculiar growth and modification of the epidermis. Externally it is covered by a layer of fine scales closely imbricated, or overlapping like the tiles of a house, but with the free edges turned upwards. It is called the cuticle of the hair. Shown in the magnified surface of a hair. The wave lines mark the upper or free edges of the cortical scales. B, separate scales.

Magnified Surface of a Hair

The hair is produced by a peculiar growth and modification of the epidermis. Externally it is covered…