The hair on our scalp can be divided into two parts, the root and shaft. The root part of hair is in the skin (epidermis)of scalp. The hair root is surrounded by a pouch like structure called follicle.
The base of hair root is in the shape of a bulb. This bulb is indented by capillaries and nerve fibers. The cells in the center of bulb divide. The newly divided hair cells push the previous cells up.