Sensory Receptors 

 

The skin contains numerous sensory receptors which receive information from the outside environment.
The sensory receptors of the skin are concerned with at least five different senses: pain, heat, cold, touch, and pressure.

The five are usually grouped together as the single sense of touch in the classification of the five senses of the whole human body.
The sensory receptors vary greatly in terms of structure.
For example, while pain receptors are simply unmyelinated terminal branches of neurons, touch receptors form neuronal fiber nets around the base of hairs and deep pressure receptors consist of nerve endings encapsulated by specialized connective tissues.

Receptors also vary in terms of abundance relative to each other.
For example, there are far more pain receptors than cold receptors in the body.
Finally, receptors vary in terms of the concentration of their distribution over the surface of the body, the fingertips having far more touch receptors than the skin of the back.