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| A scientific study of hair ands its diseases and care. Comes from the greek work "trichos" (hair) and "ology" (the study of). |
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| The hair, skin, and nails are know colectively as this which is the largest and fastest growing organ of the human body. |
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| The part of the hair located below the surface of the scalp. |
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| The portion of the hair that projects above the skin. |
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| This is the the tube like depression or pocket in the skin or scalp that contains the hair root. They are distributedall over the body with the excepection of the palms of the hands and the soles of the feet. |
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| This is the lowest area or part of a hair strand. It is the thickened club shaped structure that forms the lower part of the hair root. |
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| This is a small cone-shaped area located at the base of the hair follicle that fits into the ahir bulb. Contains the blood and nerve supply that provides the nutrients needed for hair growth. |
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| This is a tiny involuntary muscle in the base of the hair follicile. Strong emotions or cold causes it to contract which makes the hair to stand up staight resulting in goose bumps. |
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| These are oil glands of the skin connected to the hair follicles. These secrete and oily substance called sebub which lubricates the hair and skin. |
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| Is the outer most layer of the hair. It consists of an overlaping layer of transparent scale like cells that look like shingles on a roof. |
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| This is the middle layer of the hair. It is a fibrous protein core formed by elongated cells containing melanin pigment. About 90% of the total weight of hair comes from the this. |
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| This is the inter most layer of the hair and is composed of round cells. It is quite common for very fine and naturally blonde hair to entirely lack this. |
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| Hair is composed of protein that grows from cells origination within the hair follicle. This is where the hair shaft begins. As soon as these living cells form, they begin their journey upward through the hair folicle. They mature in a process called this. As these newly formed cells mature they fill up with a fiberous protein called Keratin then move upward, lose their nucleus and die. By the time the hair shaft emerges from the scalp the cells of the hair are completey keratinized and no longer living. |
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| These are proteins made of a long chain of this, that are linked together end to end like pop-beads. |
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| This is the chemical bond that links amino acids is called this. A long chain of amino acids linked by peptide bonds is called a polypeptide. |
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| This is the spiral shape of a coiled protein is called this. |
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| The cortex is made up of millions of these. These are linked like the rungs on a ladder by 3 different types of side bonds. |
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| This is a weak pysical side bond that is easily broken by water or heat. |
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| This is also a weak temporary side bond between adjacent polypeptide chains. These are easly broken by strong alkaline or acidic solutions. |
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| This is a chemical side bond that is very different from the physically bonding of a hydrogen or salt bond. This bond joins the sulfer atoms of 2 neighboring cystein amino acids to creat cystien. |
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| All natural hair color is the result of the pigment located in the cortex. These are the tiny grains of pigment in the cortex that give natural color to the hair. |
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| This provides brown and black color to the hair. |
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| This provides color ranging from red and ginger to yellow/blonde tones. |
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| The blank of the hair refers to the shape of the hair strand and is decribed as straight, wavy, curly, or extremely curly. They are the result of gentics. |
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| This is the thickness or diameter of the individual hair strand. Can be classified as coarse, med, or fine. |
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| This measures the number of individual hair stands on one sq. inch of scalp. |
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| This is the ability of the hair to absorb moisture. |
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| This is ability of the hair to stretch and return to its oringinal length without breaking. Wet hair with normal elasticity will stretch up to 50% of its orginal length. Dry hair - about 20%. |
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| This is hair flowing in the same direction resulting from follicles sloping in the same direction. |
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| This is hair that forms in a circular pattern as of the crown. |
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| This is a tuft a hair that stands straight up. |
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| This or lanugo hair is short, fine, and downy. This hair is not pigmented and almost never has a medualla. |
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| This is the long hair found on the scalp, legs, arms, and bodies of males and females. |
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| During this or growth phase newhair is produced. New cells are actively manufactured in the hair follicle. During the phases hair cells are produced faster than any other normal cell in the human body. The avg. growth of healthy scalp hair is about 1/2 in. per month. |
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| This phase is the breif transition period between the growth and restings phases of a hair follicle. It singnals the end of the growth period. |
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| This or resting phase is the final phase in the hair cycle and last until the fully grown hair is shead. |
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| Abnormal hair loss is called this. |
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| This or androgentice alopecia is the result of gentics, age, and hormonally changes that cause miniaturization of termal hair converting it to vellus hair. |
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| This is characterized by the sudden falling out of hair in round patches or baldness in spots. |
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| This is a topical medication that is applied to the scalp twice a day and has been proven to stimulate hair growth. |
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| This is the techinal term for gray hair. |
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| This is a variety of canities characterized by alternating bandn of grey and pigmented hair through out the length of the hair strand. |
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| This or hirsuties is a condition of abnormail growth of hair. It is characterized by the growth of terminal hair in areas of the body that normally grow only vellus hair. |
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| This is the technically term for spilt ends. |
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| This or knotted hair is characterized by brittleness and the formation of nodular swellings along the hair. |
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| This is the technically term for beaded hair. The hair breaks easily between the beads or nodes. Treatments include hair and scalp condtioning. |
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| This is the technical term for brittle hair. The hairs may split at any part of their length. |
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| This is the medical term for dandruff which is chatacterized by the excessive production and accumulation of skin cells. |
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| This is a natural occurring fungus that is present on all human skin, but inly devlops the syptoms of dandruff when it grows out of control. |
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| Pityriasis Capitis Simplex |
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| Techinally term for classic dandruff that is characterized bhy scalp irration, large flakes, and an itchy scalp. |
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| This is a more severe case of dandruff characterized by an accumulation of greasy or waxy scalp scales, mixed with sebrum, that stick to the scalp in crust. When accompanied by redness and inflammation, the medical term is "seborrheic dermatitis". |
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| The medical term for ringworm. It is characterized by itching, scales, and sometimes, painful circular lesions. |
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| Another type of fungal infection characterized by red papules, or spots, at the opening of the hair follicles. |
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| A highly contagious disease caused by a parasite called a "mite" that burrows under the skin. |
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| The infectation of the hair and scalp with head lice. As these parasites feed on the scalp, itching occirs and the scratching that usually results can cause infection. Head lice are transmitted from one person to anotoher by contact with infested hats, combs, brushes, and ither personal articles. |
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| This or boikl is an acute, localized bacterial infection of the hair follicle that produces pain. |
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| An inflammation of the subcutaneous tissue caused staphylococci. It is similar to a furuncle but it larger. |
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