Questions and Answers
Which of the following structures contains the blood and nerve supply that provides nutrients for hair growth?
Which layer of the hair is the outermost layer that protects the inner structure?
What is keratinization?
The process where newly formed cells in the hair bulb mature, fill with keratin, move upward, lose their nucleus, and die.
What are polypeptide chains?
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Which of the following types of bonds is weak and broken by wetting the hair?
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Which type of melanin provides natural dark brown to black color to hair?
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Where is terminal hair found on the body?
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The three phases of the hair growth cycle are ____, ____, and ____. What occurs during each phase?
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What are normal reasons for daily hair loss?
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What are the most common forms of abnormal hair loss?
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What are the only two approved hair loss treatments?
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Name the two main types of dandruff. Can either one be treated in the salon?
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Which hair and scalp disorders cannot be treated in the salon?
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What factors about the hair should be considered in a hair analysis?
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Study Notes
Hair Root Structures
- Dermal Papilla: Contains blood and nerve supply for nutrient delivery in hair growth.
- Hair Bulb: Club-shaped structure that forms the base of the hair root.
- Arrector Pili Muscle: Causes hair to erect in response to strong emotions or cold.
- Sebaceous Gland: Oil glands connected to hair follicles, responsible for lubrication.
- Hair Follicle: Tube-like depression in the skin that houses the hair root.
Hair Shaft Layers
- Cuticle: Outermost layer, serves as a protective barrier for inner hair structure.
- Cortex: Middle layer composed of fibrous protein and containing melanin pigment.
- Medulla: Innermost layer made up of round cells, though may be absent in fine hair.
Keratinization Process
- Newly formed cells in the hair bulb mature, fill with keratin, move upward, lose nuclei, and die.
Polypeptide Chains
- Long chains of amino acids linked by peptide bonds, fundamental in hair structure.
Types of Side Bonds
- Hydrogen Bond: Weak bond potentially broken by moisture.
- Salt Bond: Weak bond disrupted by strong alkaline or acidic solutions.
- Disulfide Bond: Strong bond broken by chemical processes like permanent waving or heat styling.
Types of Melanin
- Eumelanin: Provides dark brown to black hair.
- Pheomelanin: Responsible for light colors, ranging from red and ginger to yellow and blonde.
Hair Types
- Terminal Hair: Long, coarse, pigmented hair found on the scalp, legs, and arms.
- Vellus Hair: Short, fine, unpigmented hair covering most of the body, absent on palms and soles.
Hair Growth Cycle Phases
- Anagen Phase: Active growth phase for hair follicles.
- Catagen Phase: Transitional phase between growth and rest.
- Telogen Phase: Resting phase before hair is shed.
Normal Hair Loss Reasons
- Natural outcome of the hair growth cycle phases: anagen, catagen, and telogen.
Common Abnormal Hair Loss Types
- Androgenic Alopecia: Genetic form of hair loss.
- Alopecia Areata: Autoimmune-related hair loss.
- Postpartum Alopecia: Hair loss following childbirth.
Approved Hair Loss Treatments
- Minoxidil: Topical treatment for hair loss.
- Finasteride: Oral medication effective in treating hair loss.
Dandruff Types
- Pityriasis Capitis Simplex: Mild dandruff, can be treated with antifungal shampoo in the salon.
- Pityriasis Steatoides: Severe form, requires a physician's referral, not treatable in the salon.
Untreatable Hair and Scalp Disorders
- Conditions that cannot be treated in the salon include:
- Pityriasis Steatoides
- Tinea Capitis
- Tinea Barbae
- Tinea Favosa
- Scabies
- Pediculosis Capitis
- Furuncle
- Carbuncle
- Folliculitis
Hair Analysis Factors
- Key factors include:
- Texture
- Density
- Porosity
- Elasticity
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Description
Test your knowledge of the five main structures of the hair root as outlined in Milady Chapter 11. This quiz will cover essential terms and definitions that are crucial for understanding hair anatomy and physiology. Perfect for beauty students and professionals alike!
