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Cutaneous Sensory Afferents.
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Cutaneous sensory afferents are a large group of nerves
that will send a lot of different information
from the skin to the brain.
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As you can imagine, there's a lot of information that can
be garnered from our organ that is most externally placed.
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It is interacting with the environment all the time.
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And you'll need to know things like,
well is it going to be a high amount of forced being
impressed against me? Is it too hot? Is it too cold?
All these things can be tell by
the cutaneous sensory afferents.
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So let's go through some of the nerve classes
that are associated with the skin afferents.
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Skin tactile receptors are known as A beta.
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And these have a fairly slow conduction velocity,
although they are still myelinated
about 33 to 75 meters per second.
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A delta fibers, these are pain and temperature sensors.
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These also have a fairly slow conduction velocity,
5 to 30 meters per second.
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But again, these are still myelinated neurons.
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And finally, we have our slowest class,
and that's class C.
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These involve things like pain, temperature, itch receptors.
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These are all very slow unmyelinated neurons
about ½ to 2 meters per second.
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So if we compare the A beta, A delta, and Cs to the muscle spindles and the golgi tendon organs,
you can see that the skin conduction velocities are very slow in comparison.
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So the information doesn't in travel back quite as fast.
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But again, you have a lot more
surface area that might be involved.
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So you could get a lot more signals
but just not as fast.