What type of tactile sensory receptor is mainly found within the epidermis?

The Merkel cell is a type of tactile sensory receptor primarily located in the epidermis of the skin. These cells are known for their role in the sensation of touch, particularly in detecting light pressure and texture. They are connected to nerve endings, which allows for the transmission of sensory information to the brain. Merkel cells are particularly concentrated in areas of the skin that are sensitive to touch, such as the fingertips and lips, enhancing the skin's ability to perceive complex textures and shapes.

In contrast, Meissner corpuscles, while also involved in touch sensation, are primarily located in the dermis, not the epidermis. Pacinian corpuscles, on the other hand, are deep-pressure receptors found deeper in the dermis and in subcutaneous tissue. Ruffini corpuscles are also situated in the deeper layers of the skin and are responsible for sensing stretching of the skin. Thus, the unique placement and function of the Merkel cell in the epidermis make it the correct answer for this question about tactile sensory receptors.