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n. a threadlike keratinized outgrowth of the epidermis of the *skin. It develops inside a tubular hair follicle. The part above the skin consists of three layers: an outer cuticle; a cortex, forming the bulk of the hair and containing the pigment that gives the hair its colour; and a central core (medulla), which may be hollow. The root of the hair, beneath the surface of the skin, is expanded at its base to form the bulb, which contains a matrix of dividing cells. As new cells are formed the older ones are pushed upwards and become keratinized to form the root and shaft. A hair may be raised by a small erector muscle in the dermis, attached to the hair follicle.
See SKIN; WHITE HAIR.
A thread-like structure composed of dead cells containing keratin, a fibrous protein. The root of each hair is embedded in a tiny pit in the dermis layer of the skin called a hair follicle. Each shaft of hair consists of a spongy semihollow core (the medulla), a surrounding layer of long, thin fibres (the cortex), and, on the outside, several layers of overlapping cells (the cuticle). While a hair is growing, the root is enclosed by tissue called a bulb, which supplies the hair with keratin. Once the hair has stopped growing, the bulb retracts from the root and the hair eventually falls out.
Hair is involved in the regulation of body temperature (known as thermoregulation). If the body is too cold, arrector pili muscles in the skin contract, pulling the hairs upright to form goose pimples. Erect hairs trap an insulating layer of air next to the skin.Brittle hair may be due to excessive styling, hypothyroidism, or severe vitamin or mineral deficiency. Very dry hair
can be caused by malnutrition. Ingrown hairs occur when the free-growing end of the hair penetrates the skin near the follicle, which may cause inflammation. (See also hirsutism; hypertrichosis.)
The keywords of this medical terms: Hair
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Alopecia. Baldness. Shedding of the hair in patches leaving glossy bald areas. It is normal to lose about one hundred hairs a day, but severe stress such as unemployment, divorce or death in a family may considerably increase hair loss. Losses of long-standing are seldom recovered.
Causes: hormone deficiency (Agnus Castus) in females, where it may be associated with failing thyroid or ovarian function. In such cases, other agents include: Helonias, Motherwort, Black Haw bark. Other causes may be pregnancy, the menopause, or simply discontinuing The Pill. Certain skin diseases predispose: ringworm (Thuja), eczema (Yellow Dock), from thyroid disorder (Kelp, Blue Flag root).
Exposure to some cosmetics, excessive sunlight, strong chemicals and treatment of cancer with cytotoxic drugs may interfere with nutrition of the hair follicles. To ensure a healthy scalp a correct mineral balance is essential calling for supplementation of the diet with vitamins, selenium, zinc and silica. Yellow Dock is believed to counter toxicity of chemicals; Pleurisy root opens the pores to promote sweat and action of surface capillaries.
Baldness sometimes happens suddenly; eye-lashes or beard may be affected. Though emotional stress and a run-down condition is a frequent cause, most cases are not permanent, returning to normal with adequate treatment.
Baldness of the eyebrows alerts us to a lowered function of the thyroid gland, being an early outward sign of myxoedema. A pony-tail hair style or the wearing of a crash helmet may cause what is known as traction alopecia. Heavy coffee drinkers invariably lose hair lustre.
Soviet Research favours silica-rich plants internally and as a lotion: Horsetail, Burdock, Nettles, Bamboo gum.
Growth of hair is assisted by improving surface circulation of the scalp which is beneficial for conveying nutrients to the hair roots and facilitating drainage. Herbal vasodilators stimulate hair follicle nutrition and encourage growth: Cayenne, Pleurisy root, Black Cohosh and Prickly Ash, taken internally. A convenient way of taking Cayenne is the use of a pepper-shaker at table.
Topical. Hair rinse. 2-3 times weekly. Infusion: equal parts Yarrow, Sage and Rosemary. 1oz (30g) to 1 pint (500ml) water. Simmer gently five minutes. Allow to cool. Strain before use.
Cider vinegar – minimal success reported.
Day lotion. Liquid Extract Jaborandi half an ounce; Tincture Cantharides half an ounce; Oil Jojoba to 4oz. Shake well before use.
Oily lotion. Equal parts Olive and Eucalyptus oils.
Bay Rhum Lotion. Oil of Bay 50 drops; Olive oil half an ounce; Rum (Jamaica or other) to 4oz. Shake well before use.
Oil Rosemary: rub into hair roots.
Russian Traditional. Castor oil half an ounce; Almond oil 1oz; Oil Geranium 15 drops; Vodka to 6oz. Rub into hair roots.
Aromatherapy. To 1oz Castor oil and 1oz Olive oil add, 10 drops each – Oils Neroli, Lavender and Rosemary.
Gentian plant extract. Japanese scalp massage with extract from roots to thicken thinning hair. Some success reported.
Supplements. B-vitamins, Kelp, Silicea Biochemic salt. Zinc. Low levels of iron and zinc can cause the condition.
Note: Studies show that male occipital baldness confers a risk of heart disease, being associated with a higher total cholesterol and diastolic blood pressure than men with a full head of hair. Frontal baldness has not been found to be associated with increased risk of coronary heart disease and myocardial infarct. “It seems prudent for bald men to be specially vigorous in controlling risk factors for such conditions.” (S.M. Lesko, Journal of the American Medical Association, Feb 24, 1993, 269: 998-1003) ... Bartrams Encyclopedia of Herbal Medicine
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Bartrams Encyclopedia of Herbal Medicine
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