Natural hair growth cycle there are 3 phases,
anagen or growth phase
Catagen or regression phase
Telogen or resting phase
Cells of hair matrix responsible for hair growth and receive nutrients from the capillary loop from dermal papillae.
During the anagen phase or growth phase, the hair matrix actively proliferates new cells are continuously produced by active proliferation.new cells pushed upward and they differentiate to produce hair shaft.
up to 85% of hairs in normal scalp hair in this stage.after 2 to 6 years of anagen phase hair follicle merges into the catagen phase, in this phase matrix cells seized their activity, hair growth stops.
base of the hair shaft migrates away from the papillary blood supply.
You can appreciate here how hair follicle and dermal papillae begin to shrink in this phase. finally, hair follicle detached from its blood supply.
Catagen phase last for 2weeks, up to 1% of hairs in a normal scalp hair in this stage
3rd step of the hair cycle is the telogen phase,where hair follicles transit from the catagen phase to the telogen phase.
In the telogen phase where hair transferred into clubbed hair and,migrate up in hair sheath. they lack root sheath.
resting phase lasts for 1-4 months, up to 10% of hairs in a normal scalp hair in this stage.
At the start of the new anagen phase, hair follicles grasp the papillae and blood supply reconnects.
New hair grows old clubbed hair falls as the new hair grows to the same depth as in the previous cycle.
Hair length depends on the duration of the anagen phase, short hair in eyelashes,hair on arms and legs have short anagen around one month.
25 авг 2024
