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Melody Zhang

on 24 February 2017

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Transcript of Touch

What is touch?
skin sensation that results from an active or passive contact between a person's skin and an object
Gate control theory
Nerve cells that tell your brain
about tactile sensations; located
within your skin and soft tissue
perceive temperature related sensations, specifically hot and cold
perceive sensations such as pressure, vibrations, and texture
Pain receptors
detect pain or stimuli that can or does cause damage to the skin and other tissues of the body
sense the position of the different parts of the body in relation to each other and the surrounding
Concentrations of Receptors
Touch receptors are heavily concentrated in the hands, feet, and lips
these are the body parts we use to interact with the world the most
Fast pathway
Pain signals travel along pathways through the body
Physical suffering or discomfort caused by illness or injury
Signal travels directly to the spinal cord and back; similar to reflex
Slow pathway
Brain has time to process information received from touch receptors
Spinal cord contains a gate that either blocks pain signals or allows them to pass on to the brain

When you bang your head (gate is opened), you feel better after rubbing it (gate is closed)
When no input comes in, the gate is closed
When large-fiber stimulation happens (normal sensory input), the gate is closed
When small-fiber stimulation happens (pain reception), the gate is open
A neurotransmitter produced by the pituitary gland
Inhibit the transmission of pain signals and produce a feeling of euphoria ("runner's high")
Opiate drugs like morphine and codeine act similarly to endorphins
thank god
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