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The dermis is the layer of skin that plays a crucial role in providing structure and elasticity. It is located beneath the epidermis and is composed of a dense network of collagen and elastin fibers, which give the skin strength, resilience, and flexibility. This layer contains important components such as blood vessels, lymphatic vessels, hair follicles, and glands, all contributing to the overall health and function of the skin.

The collagen fibers in the dermis provide tensile strength, while the elastin fibers allow the skin to stretch and return to its original shape. This combination is essential not only for maintaining the appearance of the skin but also for protecting underlying structures and enabling movement.

The epidermis, while important, primarily serves as a protective barrier and does not have the same structural properties as the dermis. The subcutaneous layer, primarily composed of fat and connective tissue, provides insulation and cushioning rather than elasticity or strength. The term "corneous" refers to the stratum corneum, the outermost layer of the epidermis, which is primarily made of dead skin cells that protect underlying layers but does not contribute to elasticity or structural integrity.