PATHOLOGY

Detailed explanation-1: -The hair root is in the skin and extends down to the deeper layers of the skin. It is surrounded by the hair follicle (a sheath of skin and connective tissue), which is also connected to a sebaceous gland. Each hair follicle is attached to a tiny muscle (arrector pili) that can make the hair stand up.

Detailed explanation-2: -The root of the hair is made up of protein cells and is nourished by blood from nearby blood vessels. As more cells are created, the hair grows out of the skin and reaches the surface.

Detailed explanation-3: -These groups of hairs are called “follicular units.” This might come as a surprise to those who assume that each hair follicle opening contains just a single hair. In fact, less than 20 % contain a single hair. Most follicular units contain 2 or 3 hairs; a small proportion contain 4-5 hairs.