Intro to derm- hair and nails

Question 1

What is the function of the hair?

Answer 1

thermoregulation, sebum, protection against external factors, social/sexual interaction, epithelial and melanocyte stem cells, apocrine sweat

Question 2

What is the difference between vellus hair and terminal hair?

Answer 2

Velds hair can be found all over the body (except palms, soles, lips, external genitalia), terminal hair is on brows, scalp and eyelashes.

Question 3

what are the three stages of the hair cycle? What happens in each of these stages?

Answer 3

Anagen (formation of hair), catagen (regressing phase) and telogen (resting phase)

Question 4

What forms the pilosebacious unit?

Answer 4

Sebaceous gland, hair follicle, arrestor pilir muscle, dermal papilla

Question 5

What is the infundibulum and isthus?

Answer 5

Infundibulum is top part of the hair follicle isthmus is the bottom part (up till sebaceous glad)

Question 6

Where can you find hair follicle stem cells? Where do the migrate to form what?

Answer 6

In the bulge of the pilosebaciius unit. The migrate distally to form sebaceous gland and medially to form hair follicle.

Question 7

What are the functions of nails?

Answer 7

protect distal phalanx, counterpressure for walking and tactile sensation, increase dexterity, enhance sensory discrimination, facilitate scratching and grooming

Question 8

What is the hyponychium?

Answer 8

Where the nail detaches from the skin

Question 9

What is the eponychium?

Answer 9

The skin that grows to cover the lunar part of the nail

Question 10

What is the function of the nail matrix?

Answer 10

To produce nail plate.