Hair follicle is an organ from which hair grows and increases. The part of hair that you see on the scalp that is called hair shaft derives from these follicles. Hair shaft takes form in this organ. From the outside, you can just see some long hair strand. But inside the hair follicle a number of operation go on.
You cannot imagine how interesting process takes place inside the hair root. I have already described the hair growing process in the previous article. So I don’t want to describe this again. Rather I would describe the various part of hair follicles so that you can have a little idea about the inside of it.
Hair shaft: It is the main part, whichderived from the roots. The most interesting matter is that, it is made of dead cells. That is why we do not feel anything while cutting hair.
Medulla: Medulla is the most inside part of hair shaft. Although you cannot find it in the hair of everyone.
Cortex: The mid layer helps to fix the color and texture of hair.
Cuticle: Cuticles is the colorless upper part of hair.
Hair root: hair root is inner part of hair that lies inside the scalp.
Dermal root sheath: It is consist of two layers of epidermal cells. The cells are-
- External epithelial root sheath
- Internal epithelial root sheath
Arrector pili muscle: It is made with smooth muscle that is extended from hair follicle. When you are stressed or in fear situation, the nerve stimulates thearrector pili so that the hair shaft emerges from the skin.
Sebaceous gland: It is connected with hair follicle and it derives sebum an oily substance.
Hair bulb: Hair bulb is the main structure of hair follicle. Hair bulb includes various layers of different types of cells.
Beside this, external epithelial root sheath, internal epithelial root sheath, germinal matrix, papilla, hypodermis layer, artery, vein etc are some important organ of hair follicles.
Hair fall is associated with aging of hair follicles. When your hair follicles are aged, the stem cells renew each follicles. Renewal follicles then grows new hair.
Some people thing that hair grows continuously. Although it is a wrong perception. Each hair follicles has a five-year growth cycle. The more interesting matter is that, the amount of hair we see in the scalp is not 100% hair. Rather it is just 85% of total hair. Rest 15% remains in sleeping mode.