Lesson 1

Question 1

Hair growth is a result of activity of cells found in which layer?

Answer 1

The basal layer

Question 2

What are the three stages of hair growth?

Answer 2

Anagen

Catagen

Telogen

Question 3

Anagen phase

Answer 3

Growth stage where new hairs are produced

Nutrition comes from the derma papilla

• new cells are produced in the hair follicle. Activity is greater in the hair bulb, which pulses down into the dermis and swells with cell mitosis.

Question 4

Catagen phase

Answer 4

Regression or “falling out” stage

The hair shaft grows upward and detaches itself from the bulb & the derma papilla collapses

Question 5

How long does it take for the hair to grow from the papilla to the surface of the skin?

Answer 5

4-13 weeks

depends on the area of the body

Question 6

The quantity of hair a person has is predetermined by

Answer 6

Genetics

Question 7

What other factor can increase body hair?

Answer 7

Puberty

Question 8

Where does hair originate?

Answer 8

From hair follicles in the dermis

Most hair follicles are associated with sebaceous glands and combine to form the Pilo sebaceous unit

Question 9

Hair follicle

Answer 9

These are pore-like indentations of the skin from which hair grows

Question 10

Root

Answer 10

The portion of the hair which lies in the follicle

Question 11

Shaft

Answer 11

The portion of hair which is above the surface

Question 12

Bulb

Answer 12

The enlarged base of the root

Question 13

Papilla

Answer 13

Contains a blood supply and other elements essential for growth of hair

Question 14

Arrector pili muscle

Answer 14

Involuntary muscle

Attached at an angle to the base of the hair follicle

Contracts from cold or fright

Hairs stand up straight

Skin texture appears like “goose flesh”

Question 15

Sebaceous gland

Answer 15

Found all over body except palms of hands & soles of feet

The source of new hairs

Question 16

What is hair and how does it grow?

Answer 16

Hair is a keratinized structure pushed upward from the hair follicle

Follicles grow slanted and in different directions

Growth of hair is in the bulb (base) of the follicle

The dermal papilla is filled with nutrients and blood vessels necessary for hair growth

Question 17

What is responsible for the colour of hair?

Answer 17

Melanocytes

These are found in the bulb

Question 18

Where is the arrector pili muscle located?

Answer 18

Under the sebaceous gland

Question 19

What does the arrector pili muscle do?

Answer 19

Provides thermoregulation

Question 20

Strands of hair consist of three structures

Answer 20

Medulla
Cortex
Cuticle

Question 21

The medulla

Answer 21

Central inner most layer of hair which is comprised of loose keratinized cells

This layer determines TEXTURE

Question 22

The cortex

Answer 22

• This layer determines strength and colour

mass of hair

Consists of elongated keratinized cells cemented together

If the hair is pigmented, the pigment is aligned longitudinally in the cells of the cortex

Question 23

The cuticle

Answer 23

Outermost layer

Single layer of scales which overlap like shingles

Scales are translucent and non pigmented

Confines & protects the cortex *
Gives hair elasticity *

Question 24

List 3 types of hairs

Answer 24

Lanugo hair

Vellus hair

Terminal hair

Question 25

Lanugo hair

Answer 25

Soft hair found on fetuses Hair formation begins before birth and sheds after birth and is replaced with either vellus or terminal hair

Question 26

Vellus hair

Answer 26

Hair becomes stronger and pigmented, fine, soft Covers the whole body except palms, soles, lips, eyelids, nipples etc. Removing this hair against the hair growth can result in follicles producing new terminal hairs therefore it is not recommended to tweeze shave or wax these fine hairs

Question 27

Terminal hair

Answer 27

Darker, coarser hair Found on head, brows and pubic area

Question 28

How does puberty affect hair?

Answer 28

With hormone changes, follicles switch from producing Vellus hairs to producing terminal hairs

Question 29

Lice (pediculosis capitis)

Answer 29

Parasitic insect that is contagious Found in hair with egg sacs (nits) on hair shaft Lice found on public hair “crabs” Lice like clean hair

Question 30

Dandruff (Seborrheic dermatitis)

Answer 30

Dry scaly material from scalp

Question 31

Folliculitis

Answer 31

Occurs when hair follicles become inflamed May develop any area where there’s facial hair (mens beard) or body hair

Question 32

Hypertrichosis

Answer 32

Excessive hair growth in abnormal areas Genetics & hormonal levels may be a factor

Question 33

Hirsutism

Answer 33

Male pattern of hair growth in females Strong terminal hair over the extremities Acquired hirsutism can be secondary to endocrine disease of the pituitary, ovaries or adrenal glands Most often is an inherited racial characteristic commonly seen in Mediterranean populations