Structure

1) Hair Channel 2) Shaft 3) Epidermis 4) Sebaceous gland 5) Hair erection muscle 6) Hair bulb 7) Papilla 8) Nerve 9) Blood vessel

 

Shaft. The visible part of the hair is the shaft. The shaft has three layers (medulla, cortex, cuticle) composed of cells containing keratin.

Root. The hair follicle or root is a kind of tapered introflection of the epidermis in the derma, inclined at an angle of about 75°.

Bulb. All the reproductive functions giving rise to the formation of the new hair occur inside the bulb.

 

Hair figures

• Number of Hair -	average: 100.000
	fair hair: 150.000
	black hair: 110.000
	brown hair: 100.000
	red hair: 75.000
• density of hair: 200 follicle/cm2
• diameter: 0,1 mm
• daily growth: 0,3 mm
• years of life: 2/5 years