Beneath the skin, the hair grows from the follicle or root. The blood vessels at the base hair deliver the nutrition and nourishment required for the hair.
Each hair passes through four distinct stages and not all hairs are at the same stage of the lifecycle.
The Hair has two major components which can be understood as below:
The hair shaft is the portion that is above the epidermis and it comprises of three parts: the cuticle, cortex, and medulla.
It is the portion of hair which is beneath the surface of the scalp and works with the dermal papilla, hair bulb, arrector pili, sebaceous or oil gland and follicle in the formation of hair.