Epidermal ridges are created by:
a. The epidermal papillae
b. Mounds of papillary dermis arranged into dermal ridges
c. Gaps between collagen bundles in the reticular layer
d. Tight binding of the reticular layer to deeper structures
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Epidermal ridges are created by:
a. The epidermal papillae
b. Mounds of papillary dermis arranged into dermal ridges
c. Gaps between collagen bundles in the reticular layer
d. Tight binding of the reticular layer to deeper structures
What are the functions of the dermal papillae?
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Melanocytes account for the bulk of the epidermis.
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Dendritic cells are phagocytes of the immune system that protect the skin and deeper tissues from invasion by pathogens.
Keratinocytes in the superficial strata of the epidermis die because:
a. They are too far away from the blood supply in the dermis.
b. They are surrounded by a lipid-based substance that makes them more permeable to water.
c. They do not die.
d. No keratinocytes in the epidermis are alive.
Which of the following statements is false?
a. Thin skin lacks the stratum lucidum, whereas thick skin has all five epidermal layers.
b. Thick skin is located on the palms, the palmar surfaces of the fingers, the soles of the feet, and the plantar surface of the toes, whereas thin skin is located everywhere else.
c. Thick skin has numerous hairs, whereas thin skin lacks hairs.
d. Thin skin has a thin stratum corneum, and the other layers are thinner than what we find in thick skin.