Normally there are approximately 100 to 150 thousands hairs on scalp The hair passes through three phases of Hair Growth.

Anagen- Active growth- 2 to 6 years

Catagen-2 to 3 weeks-Transitional phase

Telogen-2 to 3 months-Resting phase

 

In normal scalp the hairs are in Anagen = 90-95% Catagen = <1% Telogen = 5-10%. At the end of telogen, hair is released and the next cycle is initiated. Fall of 50 to 100 hairs/day is normal. Normally scalp hairs grow at the rate of 10 to 15 m.m. per month.

Normally there are approximately 100 to 150 thousands hairs on scalp The hair passes through three phases of Hair Growth.

Anagen- Active growth- 2 to 6 years

Catagen-2 to 3 weeks-Transitional phase

Telogen-2 to 3 months-Resting phase

 

In normal scalp the hairs are in Anagen = 90-95% Catagen = <1% Telogen = 5-10%. At the end of telogen, hair is released and the next cycle is initiated. Fall of 50 to 100 hairs/day is normal. Normally scalp hairs grow at the rate of 10 to 15 m.m. per month.
 

Hair Direction, Angle & Density in “Normal Person”:

The direction of hairs & hair exit angle are different in different regions of scalp.

 

Types of Hair roots in genetically pre-disposed individual: There are two types of hair roots in a genetically predisposed individual who is prone for baldness as shown in photograph.

Those hair roots which has got “receptor” for DHT where DHT binds with them & gradually these hairs become smaller & smaller . Ultimately they will be lost for forever.

Those hair roots which does not have “receptor for D.H.T.” – There will not be any effect of DHT hormone on these roots & they will last almost for life time. These roots are situated at the back & sides of the scalp.

What is Hair Follicular Unit ?

 

Follicular unit comprises of hair root, sebaceous gland & arrector pili muscle . The unit may have single hair/two hair/ three hair/ four hair or five hairs.

 

 

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