Which layer of skin is primarily responsible for the sensation of touch?

The papillary layer is primarily responsible for the sensation of touch due to its unique structure and composition. This upper layer of the dermis is situated directly beneath the epidermis and contains a rich supply of nerve endings, including mechanoreceptors that detect tactile stimuli. These receptors are particularly sensitive to light touch and play a crucial role in the perception of texture and pressure.

Additionally, the papillary layer is characterized by its dermal papillae, which are small, finger-like projections that interdigitate with the epidermis, increasing the surface area for the exchange of nutrients and sensory information. This intimate association with the epidermis and its rich vascularization also aid in tactile sensitivity.

In contrast, the stratum corneum, while protective, is the outermost layer of the epidermis composed mostly of dead skin cells and does not have nerve endings responsible for touch sensation. The reticular layer, deeper in the dermis, contains thicker collagen fibers and is more associated with providing strength and elasticity to the skin rather than sensitivity. The subcutis, or hypodermis, is primarily composed of fatty tissue and serves as insulation and cushioning, further distancing sensory receptors from direct contact with the external environment.