Layers Of The Epidermis

Question 1

Name the 5 layers from bottom to the top.

Answer 1

Stratum basal, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

Question 2

Stratum basale

Answer 2

The bottom layer that is one cell thick and it is composed of cells constantly undergoing mitosis. Contains melanocytes.

Question 3

Stratum spinosum

Answer 3

Second layer from the bottom that is several cells thick and also undergoes mitosis. Also has melanocytes.

Question 4

Stratum granulosum

Answer 4

Third layer from the bottom where cells start to die. Lots of Keratin.

Question 5

Stratum lucidum

Answer 5

Second layer from the top. Thick skin of palms and soles where cells are dead.

Question 6

Stratum corneum

Answer 6

Top layer made of 25-30 layers of dead keratinized cells.

Question 7

In thin skin, what layer is emitted?

Answer 7

The stratum lucidum.

Question 8

What are the two types of pigment?

Answer 8

Eumelanin (dark) and pheomelanin (red tint)

Question 9

Cancer results from the abnormal uncontrolled mitosis of a group of cells. In what layers of the epidermis is it possible to get cancer? Why is it impossible to get cancer in the other layers of the epidermis?

Answer 9

Only the cells in the stratum by sounds to Adam spinosum can undergo mitosis. Melanoma results from uncontrolled mitosis of melanocytes which is in both the layers. Basal cell carcinoma is the uncontrolled mitosis of cells in stratum basal. Lastly squamous cell carcinoma comes from uncontrolled mitosis of cells in the stratum spinosum.