What is the term that refers to the connective tissue layer of the skin beneath the epidermis?

Question

BlackTom AI · Accepted Answer

The dermis is the connective tissue layer located directly beneath the epidermis.

Relevant knowledge points and concepts:
- Skin has three main layers: epidermis (outermost), dermis (middle), and hypodermis/subcutaneous tissue (deepest).
- The epidermis is stratified squamous epithelium and is avascular.
- The dermis is composed of connective tissue (primarily dense irregular connective tissue), containing collagen and elastin fibers, fibroblasts, blood vessels, lymphatics, nerves, hair follicles, and skin glands.
- The hypodermis (subcutaneous layer) is mainly adipose tissue that anchors skin to underlying structures.

Step-by-step reasoning:
1. Identify the phrase “connective tissue layer of the skin beneath the epidermis.” This explicitly asks for the layer immediately under the epidermis composed of connective tissue.
2. Compare the three skin layers:
   - Epidermis: epithelial tissue (not connective) and located above the dermis.
   - Dermis: connective tissue, situated just beneath the epidermis, providing structural support, vascular supply, innervation, and housing appendages.
   - Hypodermis/subcutaneous tissue: lies below the dermis and is mostly adipose tissue; while it is connective tissue, it is not the layer directly beneath the epidermis.
3. Histological and functional evidence favors the dermis: it contains collagen and elastin (characteristic of connective tissue), is richly vascularized (supplying the avascular epidermis), and contains sensory receptors and glands.

Why the correct answer is correct:
- The dermis matches all criteria in the prompt: it is connective tissue and lies immediately under the epidermis. Its composition and functions (support, nourishment, sensation) are characteristic of the connective tissue layer of the skin.

Why other options would be incorrect:
- Epidermis: epithelial, not connective tissue.
- Hypodermis/subcutaneous layer: deeper than the dermis and primarily adipose tissue; not the immediate connective tissue layer beneath the epidermis.

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

What is the term that refers to the connective tissue layer of the skin beneath the epidermis?单项选择题

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