Hair and Nails

Question 1

The layer of epidermis that is under the nail body is called the _____.

Answer 1

Nail bed

Question 2

The actively growing part of the nail is the _____.

Answer 2

Nail matrix

Question 3

Where are nails, hair and exocrine glands derived from?

Answer 3

Epidermis

Question 4

What layer are nails formed?

Answer 4

Stratum corneum

Question 5

What do arrector pili muscles do?

Answer 5

Contract to elevate hair (goosebumps)

Question 6

What are the functions of hair?

Answer 6

Protection, heat retention, sensory reception, and visual identification

Question 7

What are the 3 parts that hair consist of?

Answer 7

Bulb – swelling where hair originates in the dermis; root – portion of hair deep to the skin surface; and shaft – portion of hair that extends beyond skin surface

Question 8

Where does the nail root/body come from?

Answer 8

nail matrix

Question 9

Eponychium:

Answer 9

cuticle

Question 10

Lunula:

Answer 10

White half-moon shaped portion of nail

Question 11

3 types of hair:

Answer 11

Lanugo: downy hair on babies. Vellus: thin hair on most of body (peach fuzz). Terminal: thick hair (scalp, pubis)

Question 12

Hair bulb:

Answer 12

LIVING EPITHELIAL CELLS ARE HERE; HAIR PAPILLA (WHERE BLOOD VESSELS SUPPLY THE BULB); MATRIX AND NERVES; GENERATES KERATINIZED CELLS OF THE HAIR

Question 13

Hair root:

Answer 13

DEAD EPITHELIAL CELLS; CORTEX (HARD COATING AROUND HAIR; CUTICLE; HAIR FOLLICLE

Question 14

Hair shaft:

Answer 14

DEAD CELLS

Question 15

3 phases of hair growth cycle:

Answer 15

A) ANAGEN: HAIR GROWING
B) CATAGEN: HAIR GROWTH PAUSES
C) TELEGAN: HAIR RESTING PHASE AND SHEDDING