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78 terms

Milady's Standard Cosmetology, Chapter 9: Properties of the hair and scalp.

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Trichology
The scientific study of the hair, it's diseases, and its care?
Hair Root
The part of the hair located below the surface of the scalp?
Hair Shaft
The portion of the hair that projects above the skin?
Follicle
The tube like depression or pocket in the skin or scalp that contain the hair root?
Hair Bulb
The lowest area or part of the hair strand?
Dermal Papilla
Small, cone-shaped area located at the base of the hair follicle that fits into the hair bulb?
Dermal Papilla
Contains the blood and nerve supply that provides the nutrients needed for hair growth?
Arrector Pili
A tiny involuntary muscle in the base of the hair follicle, causes goose bumps?
Sebaceous Glands
The oil glands of the skin, connected to the hair follicles, secrete an oily substance called Sebum?
Cuticle
The outermost layer of hair?
Cortex
The middle layer of the hair?
Medulla
The innermost layer and is composed of round cells?
Keratin
A fibrous protein called?
Alopecia
Abnormal hair loss?
Alopecia Areata
The sudden falling out of hair in round patches or baldness in spots?
Amino Acids
Units that are joined together end to end by peptide bonds to form the polypeptide chains that comprise proteins?
Anagen
Growth phase in the hair cycle in which a new hair shaft is created?
Androgenic Alopecia
Hair loss characterized by miniaturization of terminal hair which is converted to vellus hair; in men, it is known as male pattern baldness?
Canities
Technical term for gray hair?
Carbuncle
Inflammation of the subcutaneous tissue caused by staphylococci?
Catagen
The brief transition period between the growth and resting phases of a hair follicle?
COHNS Elements
The five elements that make up human hair, skin, tissue and nails (carbon, oxygen, hydrogen, nitrogen, and sulfur)?
Cowlick
Tuft of hair that stands straight up?
Disulfide Bond
Strong chemical side bonds that join the sulfur atoms of two neighboring cysteine amino acids to create cystine?
Eumelanin
Melanin that gives brown and black color to hair?
Fragilitas Crinium
Technical term for brittle hair?
Furuncle
Boil; acute, localized bacterial infection of the hair follicle?
Hair Density
The number of individual hair strands found on 1 square inch of scalp?
Hair Elasticity
Ability of the hair to stretch and return to it's original length without breaking?
Hair Porosity
Ability of the hair to absorb moisture?
Hair Stream
Hair flowing in the same direction, resulting from follicles sloping in the same direction?
Hair Texture
Thickness or diameter of the individual hair strands?
Helix
Spiral shape created by polypeptide chains that intertwine around each other?
Hydrogen Bond
Weak physical side bond that is easily broken by water or heat?
Hypertrichosis
Condition of abnormal growth of hair, characterized by the growth of terminal hair in areas of the body that normally grow only vellus hair?
Integument
Largest and fastest growing organ of the body; composed of the hair, skin, and nails?
Keratinization
Process by which newly formed cells in the hair bulb mature, fill with keratin, move upward, lose their nucleus, and die?
Malassezia
Naturally occurring fungus that is present on all human skin, and is responsible for dandruff?
Melanin
Tiny grains of pigment in the cortex that give natural color to the hair?
Monilethrix
Technical term for beaded hair?
Pediculosis Capitis
Infestation of the hair and scalp with lice?
Peptide Bond
Chemical bond that joins amino acids to each other, end to end, to form a polypeptide chain, also referred to as end bond?
Pheomelanin
Melanin that provides natural hair colors from red and ginger to yellow/blond tones?
Pityriasis
Dandruff; an inflammation of the skin characterized by the formation and flaking of fine, thin scales?
Pityriasis Capitis Simplex
Technical term for classic dandruff; characterized by scalp irritation, large flakes, and itchy scalp?
Pityriasis Steatoides
Scalp inflammation marked by fatty (greasy or waxy) types of dandruff?
Polypeptide Chain
Long chain of amino acids linked by peptide bonds?
Postpartum Alopecia
Temporary hair loss experienced at the conclusion of a pregnancy?
Ringed Hair
Variety of canities characterized by alternating bands of gray and pigmented hair throughout the length of the hair strand?
Salt Bond
A weak, temporary side bond between adjacent polypeptide chains?
Scabies
Highly contagious disease caused by mites that burrow under the skin?
Scutula
Dry sulfur-yellow, cup-like crusts on the scalp in tinea favosa or favus?
Seborrheic Dermatitis
Medical term for pityriasis steatoids accompanied by redness and inflammation?
Sebum
Oily secretion of the sebaceous glands, which lubricates the hair and skin?
Telogen
Resting phase; the final phase in the hair cycle that lasts until the fully grown hair is shed?
Terminal Hair
Long hair found on the scalp, as well as on legs, arms, and body of both males and females?
Tinea
Medical term for ringworm, a contagious condition caused by fungal infection?
Tinea Capitis
Fungal infection of the scalp characterized by red papules, or spots at the opening of hair follicles?
Tinea Favosa
Fungal infection characterized by dry, sulfur-yellow, cup-like crusts on the scalp, called scutula?
Trichoptilosis
Technical term for split ends?
Trichorrhexis Nodosa
Knotted hair characterized by brittleness and the formation of nodular swellings along the hair shaft?
Vellus
Short, fine, unpigmented downy hair that appears on the body, with the exception of the palms of the hands and soles of the feet?
Wave Pattern
Amount of "movement" in the hair strand; described as straight, wavy, curly, and extremely curly?
Whorl
Hair that forms in a circular pattern, as on the crown?
Minoxidil
A tropical medication that is applied to the scalp twice a day, and has been proven to stimulate hair growth?
Finasteride
An oral prescription medication for hair loss, for men only?
Inactive Sebaceous Glands
Dry hair and scalp can be caused by?
Overactive Sebaceous Glands
Oily hair and scalp is caused by improper shampooing or?
Vellus and Terminal
The two main types of hair found on the body are?
Breaks Easily
Hair with low elasticity is brittle and?
Overly porous
Hair with high porosity is considered?
Normal
Hair with average porosity is considered to be?
Resistant
Hair with low porosity is considered?
Coarse
Hair texture that has the largest diameter?
Medium
The most common hair texture?
Fine
Hair texture that has the smallest diameter and is more fragile?
Elasticity
The four most important factors to consider in hair analysis are texture, porosity, density, and?
Extremely Curly Hair
Cross-sections that are highly oval and vary in shape and thickness along their length?