The hair has a long structure with keratin content. Keratin is a protein, which is resistant to rupture and corrosion. Nails also have a keratin structure. Like other proteins in the human body, keratin is a big molecule which consists of the combination of small molecules we call amino-acids. Amino acids make up the big proteins by lining up in tandem just like bead strings.
Although it varies from person to person, diameter of a typical hair strand is between 0,05 and 0,09 mm. Epidermis is the outermost layer of the skin.
Each hair strand grows out of this notch in the epidermis. Each hair strand grows out of a notch in the epidermis. The hair consists of two parts: Follicle and the body of the hair. This is a small alcove, embedded in the fat layer of the scalp, similar to a tea glass. The farthest part in the skin area of the follicle is called hair medulla. Hair medulla consists of cells, which are always alive and which split up constantly. These calls produce the long and thin hair fibers, which have a cylindrical structure. The cells producing the pigments, which give the hair its color, are also components of hair medulla. This pigment is called melanin, and the cells producing the melanin are called melanocyte. It is known that the receptors of men’s hormone (androgenes) are on the cells of this area.
At the bottom of the hair medulla, there is a structure called dermal papilla, which contains the glomerulus. This structure i crucial fort he growth and nourishment of the hair. Each hair strand is surrounded by an inner and outer follicle covering. There are a number of glands around an next to the follicle. The most important of these are sebaceous glands which secrete the sebum, a fat-type responsible for lubricating the hair.
- Various types of hair are seen in people during their life time.
- Lanugo grows as of the 3th month of the pregnancy and sheds off a short time after the birth.
- Infant type hair grows on the head, eyelashes, and brows.
- Interim hair grows around the sexual organs and on the armpit area and grows on the beard, moustache and chest area in only men.
- Terminal hair are colored hairs found in the hair, arms and legs.
http://jardinscarya.com/wp-content/plugins/page-google-maps/css/default.css What is Male Type Hair Loss: Hair follicles are controlled by hormonal factors. Androgenes and thyroid hormone (thyroxin) are the most important hormones. While some of the hair follicles are more sensitive to androgenes (male hormone), others are sensitive to throxine. Male type of androgenetic hair loss stems from the fact that, dihiydrotestesterone, a hormone found in the sensitive hair follicles, causes the weakening of the hair. Androgenetic hair loss is permanent and although it is generally a male-specific condition, it can also be observed in females. This type of hair loss, which results from genetic (familial) factors, generally starts from the hairline and the top of the head. Hair follicles sensitive to androgene first weakens and then are completely lost. Hair follicles found on the neck and the sides of the air don’t shed as they are sensitive to thyroxine.
purchase provigil generic What are the reasons of pathological hair loss: Whether men or women, everybody complaints about hair loss in some period of his/her life and worries about the possibility of going bald. Sometimes, there may be an underlying serious disease. A medication (cyclosporin, antithyroid drugs, anticoaglulants, drugs used in cancer treatment), radical changes in hormone levels (thyroid illnesses, pituitary gland illnesses, diabetes), serious physical and mental stress, air pollution, infections in the scalp or dermatologic conditions (psoriasis, eczema, lymphome) nutrition disorders (protein and iron deficiency) may be the reasons affecting hair loss. Although post-partum hair loss or hair loss after certain serious diseases are observed, these are mostly temporary.