What is the hair biology, the structure of the processes going on inside and how our health condition influences our hair appearance? Information on these issues will allow us to better understand what can we do about our hair looks and what the result will be. It is well known that hair reflects our current health condition, since they are as likely to respond to any internal changes in our body as they do to any external changes of surrounding environment. The hair structure is quite complex and for the simplification is divided into primary and secondary hair "organs". Primary hair "organs" are hair root and hair shaft. Hair consists of a root (radix pili) under the skin, and shaft (asarib) above the skin. The hair root's end expands (Ostium) with hair bulb located in the hair bag called the hair follicle. Each hair has its own follile located at different depth. Follicle depth depends on the thickness of the skin and specific body part location. Each hair root has its own hormone receptor and, actually, it is hormones almost completely controling over the duration of hair life. Secondary hair "organs" are hair muscles and oil glands. Hair muscle contraction causes the hair to move; oil glands protect hair and skin tenderness and at the same time promote hair structure hardening (keratinization). However, investigation of the hair root structure should be conducted in conjunction with it's soil - the skin study.

 

The structure of the hair root closer : 1 - artery and vein, 2 - hypodermis (subcutaneous tissue layer), 3 - the hair root; 4 - hair muscle; 5 - blood capillary network; 6 - nerve endings (Meissner) layer, 7 - oil glands; 8 - basal (fetal) layer of the epidermis; 9 - spinous layer of the epidermis; 10 - granular layer of the epidermis; 11 - transparent layer of the epidermis; 12 - sweat gland opening; 13 - the hair shaft.