Anatomy of Hair
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Anatomy of Hair
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. The cells which move upwards die slowly forming hard hair shaft.
The hair shaft has three layers the cuticle, medulla and cortex.
Cuticle is the outer layers and protects the inner layers. It is transparent. Healthy cuticle gives a shiny appearance for hair and unhealthy cuticle gives lifeless look
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Medulla is the innermost layer composed of large cells.
Cortex is the layer between cuticle and medulla. This contains
pigment and keratin. Cortex determines the bulk and strength of
hair.
The hair follicle contains oil secreting glands which make the hair
shiny .Stress and illness diminish secretion of oil and pigments
causing graying of hair.
According to Ayurveda the hair is considered as a tissue which uses
the same nutrients of
bone and considered as a tissue which is
formed as bi-product of bone tissue.
Normal hair growth cycle:
Each hair on our scalp grows approximately at the rate of 1
centimeter per month. This growth continues for 2-6 years. When the
hair attains full growth it rests for 2-3 months and is later shed.
A new hair starts growing in its place. Thus at any given point of
time 10 percent of the total hair on our scalp is in a resting phase
and 90 percent of the hair is in growth phase.
As a part of this hair growth cycle it is normal for every body to experience a little hair fall every day. Any condition in which the hair fall is more than normal is termed as hair loss. Hair loss can affect anybody irrespective of age and gender.
This article is copy righted. The author Dr.Savitha Suri is an Ayurvedic Physician and web master of http://www.ayurhelp.com
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