Our hair is the most important parts of your body. Hair is made of protein known as keratin, which grows from follicles found in the dermis, part of skin. The human body, except the palms of the hands and soles of the feet is covered with follicles which produce thick terminal and fine vellus hair – short, fine, lightly colored and barely noticed hair that develop everywhere on the human body. Hair often refers to two distinct structures: the part beneath the skin is called a hair follicle or when pulled from the head is called a bulb.
Hair grows from hair follicle located in the dermis. While hair is growing beneath the epidermis, its outer covering is soft. Once it goes past the epidermis, outer side layer hardens into keratin. Inside the hair follicle, the hair is growing and is connected to blood vessels and nerves.
The part that was growing in the follicle. This is the widest part of hair.
The middle of the length of hair (from root to tip).
The end of the hair farthest away from the root.
The cuticle is the surface layer of the hair; this layer protects the inner structure of the hair. The cuticle is made up of transparent, protective-like scale cells.
The cortex is the middle layer of the hair that provides strength and support; contains pigments that give hair its color.
The medulla is the innermost layer of the hair shaft; it is only present in fully grown hair.
Hair growth on your scalp is around six inches per year. Hair growth will be around 0.03 to 0.04 mm only. Hair growth is random. Growth is neither cyclical or seasonal. This involves three stages : (1). Anagen, (2). Catagen, and (3). Telogen.
This is the active hair growth phase. Growth of new hairs is done and hair follicles push out new hairs out of your follicles.
The hair growth during this growth phase will remain for about two to six years. There might be a problem of hair growing beyond certain length. This is due to the short phase of growth (Anagen).
Long hair is due to long phase of growth. Also there is short active hair growth phase on arm pits, limbs, eyelashes, and eyebrows about 30-45 days. Active phase of growth is not warranted at these regions.
This is the transitional phase. Atagen is the phase that follows active hair growth phase called Anagen.
Once anagen phase gets completed your hair undergoes a transitional stage. About three per cent of your hair undergoes a transitional process at any given period of time.
This phase will lasts for about a period of three to four weeks. During catagen hair growth gets stopped. The outer sheath of your hair root undergoes a shrinking process. Then your hair gets attached firmly.
This is the resting phase. Telogen is the phase that follows a transitional phase called Catagen. There is a resting period for your hair.
About 10-15 per cent of all your hairs undergo a resting process at any given period of time. Telogen is the resting phase and accounts for 10-15% of all hair.
This phase will last for about a period of 100 days (on your scalp) and it will be more than 100 days for hair on your limbs, armpits, eyelashes, eyebrows etc.
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