The skin is formed by the epidermis, dermis and subcutaneous layer.

Question

BlackTom AI · Accepted Answer

The skin has three primary layers: the epidermis, dermis, and subcutaneous layer (hypodermis).

1) Relevant knowledge points and concepts
- Epidermis: the outermost layer composed of stratified squamous keratinized epithelium (keratinocytes, melanocytes); provides barrier and protection. Common strata: basale, spinosum, granulosum, (lucidum), corneum.
- Dermis: a deeper connective tissue layer containing collagen and elastin fibers, blood vessels, nerves, hair follicles, sweat and sebaceous glands. It is divided into papillary and reticular layers and provides mechanical strength, sensation, and vascular support.
- Subcutaneous layer (hypodermis): primarily adipose tissue and loose connective tissue that insulates, cushions, stores energy, and anchors skin to underlying structures.

2) Step-by-step reasoning
- The statement names the three layers by their widely used terms: epidermis (outer), dermis (middle), and subcutaneous layer/hypodermis (deep).
- Functionally and in many educational texts, these three layers together constitute the integument and are described as the structural components of the skin.
- Each named layer has distinct histology and functions that together form the protective, sensory, thermoregulatory and metabolic roles of the skin.

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

4) Why the correct answer is correct
- Standard anatomy and physiology sources commonly present the skin as composed of epidermis, dermis and subcutaneous tissue. While the epidermis and dermis make up the “skin proper,” the hypodermis is closely associated and is often included in lay and many educational descriptions as the third layer of the skin because of its integral role in insulation, cushioning and attachment.

5) Why the other option is incorrect
- Choosing “False” would deny the common tripartite description. Although a technical distinction exists (hypodermis sometimes considered not part of the skin proper), labeling the statement false would contradict the widely taught classification that includes the subcutaneous layer as the third layer.

6) Conclusion
- Therefore the statement is True, which matches the provided correct answer.

The skin is formed by the epidermis, dermis and subcutaneous layer.Single choice

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