Lesson 2 - Skin Anatomy

Question 1

How much body weight does the skin represent.

Answer 1

15%

Question 2

What does skin do?

Answer 2

Retains Moisture
Regulates temperature 
Stores blood
Host touch receptors 
Excretes excess salts

Question 3

What are skin touch receptors for ?

Answer 3

Pain and heat

Question 4

Skin has 3 layers, what are they?

Answer 4

Epidermis
Dermis
Subcutaneous tissue ( fat layer )

Question 5

What are the cells in the epidermis called?

Answer 5

Keratinocytes

Question 6

Where do keratinocytes originate from?

Answer 6

Basal layer

Question 7

What happens when keratinocytes migrate up towards the surface of the skin?

Answer 7

They migrate up towards surface once they are there they shed and are replaced by new cells

Question 8

Epidermis layer, are Stratum xxxx?

Answer 8

Corneum
Lucidum
Granulosum
Spinosum
Basalt

Question 9

Tell me 3 things about stratum corneum…

Answer 9

Outer layer
Waterproof
If undamaged prevents bacterial/virus entering body

Question 10

Tell me 2 things about stratum lucidum

Answer 10

Found in thick skin ( palms and soles )

Contains eleidin, a protein that turns into keratin as it migrates up

Question 11

Tell me 3 things about stratum granulosum

Answer 11

3-5 layers of fat cells
Contains keratohyalin
Cells in this layer either dead or dying due to no nourishment from blood vessels

Question 12

Tell me 2 things about stratum spinosum

Answer 12

10 layers containing prickle cells and langerhans

Langerhans migrate from skin to lymph nodes in infections

Question 13

Tell me 4 things about stratum basale

Answer 13

Single layer generates cells found in epidermal layers
Rests on surface of dermis close to bloody supply
1/4 of this is melanocytes which secrete melanin into keratinocytes
Rest of cells keratinocytes