Complete the following sentence. "__________ is the largest of the 3 layers of the skin."

Question

BlackTom AI · Accepted Answer

The dermis is the largest of the three layers of the skin.

1) Relevant knowledge points and concepts
- The three layers commonly referenced are the epidermis (outermost), the dermis (middle), and the hypodermis (subcutaneous tissue).  
- The epidermis is a thin, avascular epithelial layer primarily responsible for barrier function.  
- The dermis is a thicker connective-tissue layer containing collagen and elastin fibers, blood vessels, nerves, hair follicles, and glands. It provides structural strength and houses most skin appendages.  
- The hypodermis (subcutaneous tissue) consists mainly of adipose tissue and connective tissue and lies beneath the dermis; many texts treat it as a separate subcutaneous layer rather than part of the skin proper.

2) Step-by-step reasoning
- Compare the roles and typical thicknesses: the epidermis is thin (on most body sites it ranges roughly 0.05–1.5 mm), while the dermis is substantially thicker (commonly around 0.6–3 mm depending on location) and contains the bulk of skin structure.  
- Because the dermis contains most of the skin’s volume of connective tissue, vasculature, and appendages, it is the largest of the layers traditionally considered when discussing skin structure.

3) Calculations / intermediate comparisons
- Example comparison (typical values): epidermis ≈ 0.1 mm (forearm) vs dermis ≈ 1.5 mm → dermis is ~15× thicker than epidermis.  
- Even though hypodermis thickness varies with body site and body fat, it is anatomically considered subcutaneous tissue rather than the skin’s primary structural layer; standard anatomical teaching identifies the dermis as the principal, largest layer of the skin itself.

4) Why the correct answer is correct
- The dermis contains the majority of the skin’s structural mass and is substantially thicker than the epidermis, making it the largest layer in standard anatomical descriptions of the skin.

5) Why the other options are incorrect
- a. Hypodermis: subcutaneous tissue beneath the skin, not considered the principal skin layer in standard definitions here.  
- c. Hyperdermis: not a correct anatomical term.  
- d. Epidermis: outermost and thinnest layer.

Conclusion: The correct answer is b. Dermis, which matches the provided answer.

Complete the following sentence. "__________ is the largest of the 3 layers of the skin."单项选择题

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