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Properties of hair and scalp

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Tessa Mortimore

on 17 February 2014

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Transcript of Properties of hair and scalp

Summary and Review (continued)
What are the only two approved hair loss treatments?
Name the two main types of dandruff and state whether either can be treated in the salon.
Which scalp and hair disorders cannot be treated in the salon?
What four factors should be considered in hair analysis?
Summary and Review (continued)
Name and describe the two types of hair and their locations on the body.
What are the three phases of the hair growth cycle and what occurs during each?
What is the reason for normal daily hair loss?
What are the most common types of abnormal hair loss?
Use clarifying shampoos.
Eat a well-balanced diet.
Shampoo regularly and frequently.
Avoid strong soaps, detergents, or products with high alcohol content.
Oily Hair and Scalp
Hair stream (hair flowing in same direction)
Whorl (hair forms in a circular pattern)
Cowlick (tuft of hair that stands straight up)
Growth Patterns
Low – thin hair
Medium – average thickness
High – dense or thick hair
Average: 2,200 hairs per square inch
Blond: 140,000
Brown: 110,000
Black: 108,000
Red: 80,000
Hair Density
Pityriasis capitis simplex
Pityriasis steatoides
Scalp Disorders
Minoxidil (topical treatment)
Finasteride (oral treatment)
Hair Loss Treatments
Less attractive
Less assertive
Less successful
Less personally likeable
Older by five years
Hair Loss Perceptions
Melanin (tiny grains of pigment)
Eumelanin (provides brown/black color)
Pheomelanin (provides yellow to red/ginger color)
Natural hair color (result of ratio of eumelanin to pheomelanin)
Gray hair (absence of melanin)
Hair color versus haircolor
Hair Pigment
Bonds of the Hair
Carbon – 51 percent
Oxygen – 21 percent
Hydrogen – 6 percent
Nitrogen – 17 percent
Sulfur – 5 percent
COHNS Elements
Proper nutrients required.
Hair made up of 20 amino acids. Body produces 11 of the 20.
Proteins are sources of amino acids.
Healthy Hair
Objectives (continued)
Describe the hair growth process.
Discuss the types of hair loss and their causes.
Describe the options for hair loss treatment.
Recognize hair and scalp disorders commonly seen in the salon and school and know which can be treated by cosmetologists.
Name and describe the structures of the hair root.
List and describe the three layers of the hair shaft.
Describe the three types of side bonds in the cortex.
List the factors that should be considered in a hair analysis.
“Any fact facing us is not as important as our attitude toward it, for that determines our success or failure. The way you think about a fact may defeat you before you ever do anything about it. You are overcome by the fact because you think you are.”

– Norman Vincent Peale
You have completed one unit of study toward course completion.
Summary and Review (continued)
List and describe the three types of side bonds. Which are permanent and which are temporary? Which are strongest and why?
Name and describe the two types of melanin responsible for natural hair color.
Name and describe the five main structures of the hair root.
Name and describe the three layers of the hair.
Describe the process of keratinization.
What are polypeptide chains?
Summary and Review
Hair appears dull, dry, lifeless.
Avoid frequent shampooing, strong soaps, detergents, or products with a high alcohol content.
Dry Hair and Scalp
Normal elasticity
Low elasticity
Testing for elasticity
Testing for Porosity
Testing Hair Texture
Temporary hair loss at conclusion of pregnancy
Growth cycle returns to normal within one year after delivery of baby.
Postpartum Alopecia
Sudden loss in round or irregular patches.
Affects five million people in the United States
Immune system attacks hair follicles
Begins with small bald patches
Occurs in males and females of all ages and races
No sign of scalp inflammation
No obvious signs of skin disorder
Alopecia Areata
Progressive shrinking or miniaturization of terminal hair
Affects millions of men and women in the United States
Androgenetic Alopecia
Negative social and emotional effects; preoccupation with baldness; effort made to conceal
Devastation; anxiety; feelings of helplessness and unattractiveness
Emotional Impact of Severe Hair Loss
Natural shedding: 35 to 40 hairs per day
Abnormal loss called alopecia.
Androgenetic alopecia, alopecia areata, postpartum alopecia
Hair Loss
Clipping, cutting makes hair grow faster.
Scalp massage increases growth.
Gray hair is coarser and more resistant.
Natural curl determined by race.
Round cross section is straight.
Oval cross section is wavy.
Flat cross section is curly.
Hair Growth Myths
Anagen (growing phase)
Catagen (transition phase)
Telogen (resting phase)
Growth Cycles of Hair
Vellus (lanugo) hair: short, fine, downy, unpigmented hair on body.
Terminal hair: long, thick, pigmented hair found on scalp, legs, arms, and body.
Types of Hair
Linked like pop beads
Peptide or end bonds
Polypeptide chain
Amino Acids
Keratinization: cell maturation
90 percent protein: amino acids composed of five elements
Chemical Composition of Hair
Trichology: the scientific study of hair, its diseases, and its care
Integument: system includes hair, skin, nails
Hair: slender, threadlike protein filament that is an appendage of the scalp and body
–Hair root: lies beneath the scalp
–Hair shaft: projects above the scalp
Furuncle or boil
Staphylococci Infections
Scabies (itch mite)
Pediculosis capitis (head lice)
Parasitic Infections
Tinea capitis
Tinea favosa
Fungal Parasites
Congenital canities
Acquired canities
Ringed hair
Hair Disorders
Straight hair
Wavy hair
Extremely curly hair
Asian hair
Caucasian hair
African-American hair
Wave Patterns
Hair bulb
Dermal papilla
Arrector pili
Sebaceous glands
Structure of Hair Root
Hair Analysis and Texture
Trichorrhexis nodosa
Hair Disorders (continued)
Trichorrhexis nodosa
Fragilitas crinium
Hydrogen bonds
Salt bonds
Disulfide bonds
Side Bonds of the Cortex
Hair Shaft Structure
Low porosity
Average porosity
High porosity
Objectives (continued)
Describe the hair growth process.
Discuss the types of hair loss and their causes.
Describe the options for hair loss treatment.
Recognize hair and scalp disorders commonly seen in the salon and school and know which can be treated by cosmetologists.
Properties of the
Hair and Scalp
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