Integumentary System Embryology 1

Question 1

What germ layer forms the connective tissue?

Answer 1

Mesoderm

Question 2

What germ layer forms the epidermis?

Answer 2

Ectoderm

Question 3

From what do the dermis and hypodermis arise?

Answer 3

Mesoderm

Question 4

How does the periderm develop?

Answer 4

Ectoderm cells proliferate and form a layer of epithelium called periderm and a basal layer at the same time

Question 5

What happens to the periderm?

Answer 5

The cells undergo keratinization and desquamation and are slowly replaced by other cells rising from the basal layer

Question 6

Those aforementioned exfoliated peridermal cells turn into what?

Answer 6

A white greasy substance that covers the whole fetal skin called vernix

Question 7

What germ layer forms the retina of the eye?

Answer 7

Ectoderm

Question 8

What is the lanugo?

Answer 8

A downy coat of delicate hairs that cover a 5-6 mo old fetus

Question 9

Sweat and sebaceous glands develop from what?

Answer 9

Sebaceous glands develop from epithelial root sheaths of hair follicles and eccrine sweat glands develop from down growths in the mesenchyme