Vivandi Hair Science: The Hair Follicles

Most of the hair loss treatment solutions are focused in reviving and rejuvenating this vital part, here is a deeper view on how it functions and the role it plays for hair re-growth.

There are two different structures of hair. One is the the follicle itself, which is present in the skin and number two is the shaft, which is visible just above the scalp.
A tunnel-like segment of the epidermis, the hair follicle extends down into the dermis. The structure contains several layers included in the structure have separate functions to perform. At the base of the follicle is the papilla, which contains capillaries, or tiny blood vessels that nourish the cells. The living part of the hair is the very bottom part surrounding the papilla, called the bulb. The cells of the bulb divide every 23 to 72 hours, remarkably faster than any other cell in the body.

Two sheaths, an inner and outer sheath, surround the follicle. These structures protect and form the growing hair shaft. The inner sheath follows the hair shaft and ends below the opening of a sebaceous (oil) gland, and sometimes an apocrine (scent) gland. The outer sheath continues all the way up to the gland. A muscle called an erector pili muscle attaches below the gland to a fibrous layer around the outer sheath. When this muscle contracts, it causes the hair to stand up which also causes the sebaceous gland to secrete oil.

The sebaceous gland is vital because it produces sebum, which conditions the hair and skin. After puberty our body produces more sebum but as we age we begin to make less sebum. Women have far less sebum production than men do as they age.

More on Vivandi Hair Science, stay on-line for our daily blogs on hair & scalp facts, for you to understand better what your hair is all about. For more information on how to take care of hair and scalp, please log on to, today.


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