Papillary Dermis: This is the uppermost layer, directly beneath the epidermis. It consists of loose connective tissue and contains capillaries, sensory neurons, and thin collagen fibers. The papillary dermis forms finger-like projections called dermal papillae, which interlock with the epidermis, increasing the surface area for the exchange of oxygen, nutrients, and waste products. Reticular Dermis: This is the thicker, deeper layer of the dermis, composed of dense irregular connective tissue. It contains thicker collagen fibers, elastin fibers, and the main structural elements that give skin its strength and elasticity. This layer also houses the bulk of skin appendages like hair follicles, sweat glands, and sebaceous glands.
