What are the three main layers of the skin?

The correct choice identifies the three primary layers of the skin as the epidermis, dermis, and hypodermis.

The epidermis is the outermost layer of the skin, primarily composed of keratinized epithelial cells, providing a barrier and protective function. Beneath the epidermis lies the dermis, which contains connective tissue, blood vessels, hair follicles, and glands, playing a crucial role in thermoregulation, sensation, and structural integrity. The hypodermis, also known as the subcutaneous layer, is located beneath the dermis and consists of fatty tissues that provide insulation and energy storage, as well as cushioning for the underlying structures.

In this context, other options do not accurately represent the main structural layers of the skin. For instance, epidermal ridges and dermal papillae are specific features or extensions within the epidermis and dermis that enhance grip and prevent slipping, but they are not layers themselves. Similarly, referencing the layers as the outer, middle, and inner lacks specificity relating to the established terminology of skin anatomy. Lastly, the stratum corneum, stratum lucidum, and stratum granulosum refer specifically to layers within the epidermis rather than distinct skin layers,