Understanding How Hair Grows
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Understanding How Hair Grows
The hair system is known the pilosebaceous system.
It consists of four main parts:
1. Follicle - the hair canal
2. Papilla - the organ that feeds hair growth
3. Sebaceous Gland - the associated oil gland
4. Hair - shaft or structure which has hardened (keratinized)
Follicle
A hair follicle is an indention in the skin.
The inside of each follicle therefore is much like the skin’s
surface being an inward fold into the skin with a mechanism for
producing a hair.
The lower portion of the follicle has an expanded shape and is
called the follicle bulb where there is an area of actively
dividing cells called the hair matrix.
This is the source of hair production. The follicle and the hair
it produces continue through repeated cycles of growth and rest.
Papilla
At the base of the follicle lies a tiny structure made of skin-
related cells called the dermal papilla which feeds the newly
formed hair cells from its blood supply.
These newly formed hair cells grow continuously and die
continuously, forming a hardened or keratinized structure - the
hair shaft.
The hair shaft continues to grow outward from the follicle base.
Sebaceous Gland
The sebaceous glands or oil glands are located close beneath the
surface of the skin over the entire body.
There are a large number concentrated in the facial area.
The oily material secreted is called sebum.
Sebum lubricates the hair shaft and the skin.
Hair
The papillary region is often referred to as the “hair root,” the
portion which grows below the surface of the skin which is
contained within the follicle canal.
The hair shaft is the portion of the hair that grows above the
skin surface.
Generally speaking, two types of hair are produced by the
follicle:
vellus
terminal
Vellus hair is like “peach fuzz” and it is normally found on a
woman’s cheek or a young child. It is soft, downy and colorless.
The follicles producing vellus hair are shallow, and the hair
shaft produced is relatively short. Vellus hair is normal in
women and is not treated with permanent hair removal techniques
such as electrolysis.
Terminal hair is deeply rooted, coarse, and colored. Terminal
hair begins as the peach fuzz type but later develops color and
some degree of coarseness at which point it becomes the terminal
type.
Terminal hair grows from the scalp, eyebrows, underarms, pubic
area, and other parts of the body.
It is terminal hair which many people regard as unwanted and
therefore try to remove from certain body areas.
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