Which layer of the skin contains blood vessels and nerves?

The dermis is the layer of skin that contains blood vessels and nerves. It is situated beneath the epidermis and above the subcutaneous layer. The dermis is responsible for providing structural support and nourishment to the skin due to its vascular network, which supplies oxygen and nutrients to the living cells of the epidermis.

Additionally, the dermis houses various sensory receptors that enable the skin to respond to external stimuli, such as touch, pressure, and temperature. This layer is also rich in collagen and elastin fibers, which contribute to the skin's strength and elasticity.

In contrast, the epidermis is the outermost layer and does not contain blood vessels; instead, it relies on the dermis for nutrient exchange. The subcutaneous layer, while important for insulation and cushioning, is located below the dermis and primarily consists of fatty tissue. The stratum corneum is the outermost part of the epidermis, comprised of dead skin cells that provide a protective barrier but does not have any blood vessels or nerves. Thus, the importance of the dermis as the layer with blood vessels and nerves makes it the correct answer.