Properties Of The Hair Chp 9

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properties of

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hair and scalp

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trichology

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greek : Trichos -hair
ology - study of

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integument

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means hair nails skin; are known collectively ; it is the largest and fastest growing organ of the human body

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hiar root

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is the part located below the surface of the scalp

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hair shaft

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is the portion of the hair that projects above the skin

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follicle

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the tube -like depression or pocket in the skin or scalp that contains the root

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dermal papilla

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cone shape area located at the base of the hair follicle and fits in the hair bulb

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arrector pili

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is the tiny involuntary mucles in the base of the hair follicles. this is where you get goose bumps from

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sebaceous glands

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are the oily glands of the skin connected to the hair follicles

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sebum

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oily substance that come out of your sebaceous gland which lubricates the hair and skin

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cuticle

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is the outermost layer of hair it has overlapping layer of transparent scale like cells

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cortex

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is the middle layer of the hair about 90% of the total weight of the hair comes from the cortex

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medulla

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is the innermost layer and is composed of round cell and only thick course hair contain medulls

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keratinization

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is when the newly formed cell matures

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cohens elements

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the five main elements that make up human hair are refered to this

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the five main elements that make up human hair are

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carbon, oxygen, hydrogen, nitrogen, sulfur
carbon being the highest and sulfur being the lowest

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what are the protiens in hair
how they work

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amino acids,peptides, bonds,helix
amino acids link toghether end to end like pop beads the chemical bond that links amino acids are called peptide bonds polypeptide a long chain of amino acids linked by the peptide bonds are called polypeptide these protiens are long coiled. the spiral shape of the coiled protien is called helix

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hydrogen bond

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is a weak physical side bond that is easily broken

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salt bond

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is also weak temporary side bond between adjacent polypeptide chains these are easily broken by strong alkaline or acidic solution

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disulfide

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joins the sufur atoms of two neighboring cysterine amino acids

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melanin

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are the tiny grain pigment in the cotex that gives color to the hair

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name the two types of melamin

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Eumelanin _ provides brown and black color to hair
Pheomelanin_provides color ranging from red and ginger to yellow /blondes tones

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wave patterns

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refers to the shape of the hair strand and described as straight wavy curly or extremely curly

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hair texture

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is the thickness or diameter of the individual hair strand

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hair texture can be ??

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coarse medium or fine

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course hair texture

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has the largest diameter . it is stronger than fine hair

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medium hair texure

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is most comon and is the standard to which other hair is compared

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fine hair texture

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has the smallest diameter and is more fragile easier to process and more suscepible to damage from chemicals service

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hair density

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measure the number of individual hair strands on a 1square inch of the scalp

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average hair density

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2,200 hair per sq. inch

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aveage hair density by color

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blonds- 140.000
brown- 110,000
black- 108,000
reds- 80.000

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hair proosity

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is the ability of the hair to absorb moisture

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hair elasticity

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is the ability of the hair to stretch and return to its original length without breaking

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hair stream

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is the hair flowing in the same direction

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whorl

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is the hair that forms in a circular pattern as a on the crown

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cowlick

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is a tuft of hair that stands straight up

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dry hair and scalp

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are caused by inactive sebacous glands ,aggravated by excessive shampooing

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oily hair and scalp

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caused by improper shampooingor overactive sebaceous gland

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vellus

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short fine hair it is found on parts of the body that is consider hairless arms forehead ect

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terminal hair

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is long hair found on the scalp legs this hair is coarse and is pigmented it has dark color and coarse texture

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the three phases of growth cycle are

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anagen , cartgen and telogen

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anagen

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growth phase in the hair cycle in which a new hair shaft is created

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cartagen

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the brief tranisition period between the growth and resisting phase

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telogen

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resting phase the final phase in the hair cycle that last till the fully grown hair sheds

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androgentic alopecia

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Genetic age and hormonal changes that cause miniaturization of terminal hair to turn vellus (male pattern baldness)

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alopecia areata

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sudden falling out of the hair in round patches

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potpartum alopecia

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tempory hair loss after given birth

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minoxidil

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this is a topical medication that is applied to the sclap twice a day

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finasteride

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oral prescription medication for men only

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what can hair stylist do for baldness

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they can only wigs toupees hair weaving and extensions

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canities

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techinical term for gray hair

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what are the two types of canities

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congenital - exist at or before birth
aquired - delevops with age

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ring hair

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is a variety of canities, alternating bands of gray and pigment hair throughout the hair strand

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hypretrichosis

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is a condition of abnormal growth of hair it is terminal hair growth where only vellus hair grows

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treatment for hypretrichosis

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electrolysis ,protoepilation,laser,shaving tweezing,threading and sugaring

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trichopilosis

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this is a techinal term for split ends

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trichorrhexis nodosa

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knotted hair characterized by brittleness and the formation of nodular swelling along the hair shaft

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monilethrix

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is techinical trem for breaded hair

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fragilitas crinum

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techinical term for brittle hair

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pityriasis

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medical term for dandruff

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malassezia

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is a naturally occuring fungus that is present on all human skin but developes symptons of dandruff when it grows out of controll

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pityrisis capitis simplex

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is a technical term for classic dandruff by scalp irritation

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pityiasis steatoides

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is a more serve dandruff charaterized by an accummulation of greasy or waxy scalp scales mixed with sebum that stick to the scalp in crusts

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tinea

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ringworms

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tenea capitis

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fungal infection with red papules or spots

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tinea favosa

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DRY SULFUR-YELLOW CUP LIKE CRUST ON THE SCALP

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SCABIES

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PARASITE CALLED MITES

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PEDICULOSIS CAPITIS

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INFESTATION OF HAIR AND SCALP WITH HEAD LICE