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There are quite a number of different sensory receptors in skin, and they are usually grouped by functional categories. Mechanical receptors include Meissner's corpuscles, which are sensitive to light touch and vibration, Pacinian corpuscules, which sense deep pressure and pain, Merkel's discs, which sense pressure, and Ruffini corpuscles, which sense stretch. There are also two different kinds of thermoreceptors, which sense either hot or cold.
If your hypothetical square inch of skin is located on the tongue, there may also be chemoreceptors in the form of taste buds.
The density of these different receptors varies widely depending on what area of the body the skin is on. In humans, they tend to cluster densely on the lips, genitalia, and hands, while they are much more widely spaced on the back and legs.
i was looking for some numbers, but the answer is just to generic. We know there many types and it's difrent for every part of the body, but perhaps can give a average number .....
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