Question at position 13 The epidermis contains blood vessels and nerves.TrueFalse单项选择题
A
True
B
False

Question

Question at position 13 The epidermis contains blood vessels and nerves.TrueFalse

BlackTom AI · Accepted Answer

The epidermis is avascular (contains no blood vessels) and does not house the primary nerve endings responsible for most cutaneous sensation, so the statement is False.

1) Relevant knowledge points and concepts
- Skin has three main layers: epidermis (outer), dermis (middle), and hypodermis/subcutaneous (deep).
- The epidermis is composed primarily of keratinocytes arranged in stratified squamous epithelium (strata: basale, spinosum, granulosum, lucidum [where present], corneum).
- The epidermis receives nutrients and oxygen by diffusion from blood vessels in the underlying dermis because it is avascular.
- Sensory receptors (Meissner’s corpuscles, Pacinian corpuscles, Ruffini endings) and most free nerve endings are located in the dermis; specialized epidermal cells (Merkel cells) are mechanoreceptor-associated but are not blood vessels or independent nerves.

2) Step-by-step reasoning
- The question asserts the epidermis “contains blood vessels and nerves.”
- Because the epidermis is avascular, it cannot contain blood vessels; all capillaries are in the dermis and supply the epidermis by diffusion.
- Although sensory function involves epidermal-associated Merkel cells, the axons/nerve fibers and primary sensory receptors are located in the dermis (and some free nerve endings may extend only into the deepest epidermal layers).
- Therefore the claim that the epidermis contains blood vessels and nerves as its own structures is incorrect.

3) Calculations
- No numerical calculations are required for this anatomical fact.

4) Why the correct answer is correct
- The defining anatomical fact is that the epidermis lacks blood vessels and depends on dermal circulation; sensory innervation is primarily dermal. Thus “contains blood vessels and nerves” is not true for the epidermis itself.

5) Why the other option is incorrect
- “True” is incorrect because it implies the epidermis has intrinsic blood vessels and nerve structures; in reality blood vessels are absent and nerve endings are primarily in the dermis (only specialized epidermal cells interact with nerve fibers).

6) Conclusion
- The correct answer is False, which matches the provided answer.

Question at position 13 The epidermis contains blood vessels and nerves.TrueFalse单项选择题

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