What are the two main divisions of the skin?

The correct choice identifies the two main divisions of the skin as the dermis and epidermis. The epidermis is the outermost layer of the skin, providing a protective barrier and playing a significant role in various functions like sensation and the prevention of water loss. Beneath the epidermis lies the dermis, which contains connective tissue, hair follicles, sweat glands, blood vessels, and nerves. This layer is essential for providing structure and elasticity to the skin, as well as for housing the components necessary for sensation and thermoregulation.

The other options do not accurately represent the primary divisions of the skin. The subcutaneous layer, although important, is part of the deeper skin structures but is not considered one of the main divisions. The term "subdermis" is not commonly used in dermatology, while "stratum" and "lamina" refer to specific layers or structures rather than divisions. Thus, recognizing the dermis and epidermis as the two main divisions is fundamental to understanding skin anatomy and its functions.