The word touch comes from Latin (tactus), it is one of the five senses of the human being, together with taste, smell, vision and hearing, thanks to them they can receive sensations of contact, temperature and pressure.
The touch lies mainly in the skin, the largest organ of the human body and has many nerve endings to transform external stimuli information can be analyzed and interpreted by the brain. There are many types of nerve receptors involved in touch such as the corpuscles of pacini, ruffini, Krause, meissner.
The corpuscles of pacini are sensory systems of the skin that respond to intense and deep vibrations that detect the stretching and distinguishing movements in the skin as well as the pressure located on the tendons of the muscles and in the joints, their stipulation is very painful.
The ruffini corpuscle is part of the group of the heat- resistant sensory system and is found mainly in the palms of the hands and toes, they are cylindrical in shape and are formed by connective tissues, within which it is ratified by the fiber nervous.
The corpuscles of Krause are the sensory nervous system sensitive to cold and are the smallest within the sectorial system, they are spherical and are formed by connective tissues, and inside they penetrate and branch to the nerve fiber.
The Meissner corpuscle is what is involved in light and vibratory sensations surface and consists of connective tissues and have an ovoid shape.
