Epidermis

Question 1

Stratum Corneum

Answer 1

Horny layer, dead cells filled with protein keratin
Protects against heat, pathogenic microorganisms, chemicals, and light

Question 2

Stratum Lucidum

Answer 2

Clear, flat cells with a pre-keratin substance called eleidin
Found primarily in the palms of the hands and soles of the feet

Question 3

Stratum Granulosum

Answer 3

layers of flattened cells containing keratinocytes which will produce keratin

Question 4

Stratum Spinosum

Answer 4

Spinyness is artifactual
Tonofilaments (bundles of protein) resist tension
Where keratin is produced through many of these cells

Question 5

Stratum Basale or Stratum Germinativum

Answer 5

Single layer of cuboidal and columnar cells that undergo mitosis and become cells of the superficial layers
Attached to dermis; youngest cells