Multiple Choice
Which of the following correctly lists the layers of the epidermis from superficial to deep?
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5. Integumentary System
The Epidermis: Layers
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Which layer of the skin lacks blood vessels (is avascular)?
A
Dermis
B
Hypodermis (subcutaneous layer)
C
Papillary layer of the dermis
D
Epidermis
Verified step by step guidance1
Understand the structure of the skin, which consists of three main layers: the epidermis, dermis, and hypodermis (subcutaneous layer).
Recall that blood vessels are responsible for supplying nutrients and oxygen to tissues, and their presence or absence defines whether a layer is vascular or avascular.
Identify that the dermis and hypodermis contain blood vessels, as they are deeper layers involved in nutrient supply and thermoregulation.
Recognize that the epidermis is the outermost layer of the skin and is composed mainly of keratinized epithelial cells, which do not contain blood vessels, making it avascular.
Conclude that because the epidermis lacks blood vessels, it relies on diffusion of nutrients from the underlying dermis to survive.
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