Hair is valuable assets that start developing from the 22nd week of development of a fetus. Almost all hair follicles get formed with the average count of 5 million with one million on scalp but with the growth, this density go on reducing due to expansion of scalp with age.
Basically there are two structures of hair- hair follicles and hair shafts. If we consider the hair under the microscope then there are many facts to be disclosed. Hair is not basically living structure as made up of a dead protein called Keratin. Hair shafts are made up from this hard protein in the three layers. Hair bulbs are the base of hair follicles and each follicle consists individual hair into the scalp. In under the hair bulb hair cells get divided and grow to make hair shafts and these cells get nourishment from the blood vessels.
So in general hair has three parts that are roots, shafts, and tip that are made up of three layers:-
On an average basis human hair grow 6 inches per year and .3 mm daily and approximately 100-150 hair falls. So it is important to understand that how hair grown and fall. Human hair undergoes from the cyclic pattern of growth which is known as hair growth cycle.
Basically this cycle includes three stages:-
It is active phase of hair and during this growth phase hair grows 1cm in 28 days and this phase remain active for 2-6 years.
So durability of this phase is the basis for the length of hair if the person is having short hair then it can be assumed that person has a short active growth phase and opposite to it person with long hair have an active phase of growth. if we consider hair on arms, legs and other body parts then these have very short active phase about 30-45 days
This phase is also known as transitional phase and not more than 3% hairs remains in this stage at particular time. This phase remains for 2-3 weeks generally during which the hair growth stops and hair follicles get shrunk means the outer root of hair shrinks and get attached to the root of hair to form the hair club.
In this phase generally 6%-8% hair follicles remain at one time and it lasts for the 100 days and even this phase can be longer for hair on body parts. During this phase hair club completely get formed and rest. In this phase old hair stay on rest and the new ones start with the growth.
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