Skin 1

Question 1

Where does the epidermis originate from

Answer 1

Ectoderm

Question 2

Where does the dermis originate from

Answer 2

Mesoderm that comes into contact with the inner surface of the epidermis

Question 3

What is the mesoderm essential for inducing

Answer 3

Differentiation of epidermal structures ( e.g. hair follicles)

Question 4

Overview of the formation of the skin

Answer 4

Epidermis forms by week 4 as a basal layer of cuboidal cells
Second layer of squamous , non keratinising cuboidal cells ( periderm ) develops

Basal layer of Cuboidal cells ( stratum germinativum ) proliferates to form multilayered intermediate zone for the four superficial strata

Epidermal ridges protrude as thoughts into developing Dermis beneath neurovascular supply develops into dermal papillae

Weeks 9-13 development of hair follicles in stratum germinativum and appearance of lanugo hair

Question 5

What does the periderm produce

Answer 5

White waxy protective substance - vernix caeseosa

Question 6

What are the four superficial strata of the epidermis

Answer 6

Strata spinosum ( spinous)
Strata granulosum ( granular)
Strata lucidum ( clear and found in the palms of hands and soles of feet) 
Strata corneum ( horny)