Which layer of skin provides nutrition to the epidermis?

The dermis is the layer of skin positioned beneath the epidermis, and it plays a crucial role in providing nourishment to the epidermis. This layer contains a network of blood vessels that supply essential nutrients and oxygen to the epidermis through diffusion. Since the epidermis itself lacks blood vessels, it relies entirely on the dermis for nourishment.

Additionally, the dermis is rich in connective tissue, hair follicles, sweat glands, and various sensory receptors, which contribute to the skin's functionality and provide a supportive environment for the epidermal cells. This connection is vital for maintaining the health of the skin, as it helps in the healing process and overall skin integrity.

The other layers mentioned do not serve this specific purpose. The hypodermis, for instance, primarily functions as a fat storage layer and provides insulation, while the stratum corneum is the outermost layer of the epidermis responsible for protection but does not actively supply nutrients. Therefore, the dermis is critical for supporting the epidermis and ensuring its proper functioning.