Epidermis

Question 1

Layers of the epidermis:

Answer 1

Come Let’s Get Sun Burned – STRATUM CORNEUM > STRATUM LUCIDUM > STRATUM GRANULOSUM > STRATUM SPINOSUM > STRATUM BASALE

Question 2

STRATUM CORNEUM:

Answer 2

MOST SUPERFICIAL; 20-30 LAYERS OF ANUCLEATE SQUAMOUS

Question 3

STRATUM LUCIDUM:

Answer 3

2-3 LAYERS OF DEAD KERATINOCYTES; only found IN THICK SKIN (PALMS AND SOLES); FLAT KERATINOCYTES; LOOK CLEAR UNDER MICROSCOPE

Question 4

STRATUM GRANULOSUM:

Answer 4

3-5 LAYERS OF KERATINOCYTES; PROCESS OF keratinization BEGINS HERE (CELLS DIE); DISTINCT GRANULES IN CYTOPLASM

Question 5

STRATUM SPINOSUM:

Answer 5

SEVERAL LAYERS OF POLYGONAL KERATINOCYTES ATTACHED TO NEIGHBORS BY DESMOSOMES; DAUGHTER CELLS OF BASALE; HAS EPIDERMAL DENDRITIC CELLS

Question 6

STRATUM BASALE:

Answer 6

SINGLE LAYER OF CUBOIDAL/COLUMNAR SHAPE CELLS, CONNECT TO THE BASEMENT MEMBRANE; WILL FIND KERATINOCYTES, MELANOCYTES, AND TACTILE CELLS; cell division HAPPENS HERE

Question 7

What cells are found in the epidermis? (4 of them) What do they do?

Answer 7

Keratinocytes – most abundant; melanocytes – make melanin; epidermal dendritic cells – immune response; and tactile cells – sensitive to touch

Question 8

What is skin color a result of?

Answer 8

Hemoglobin in blood vessels of the dermis, melanin pigment, and carotene pigment