Cutaneous Sensory Afferents.
Cutaneous sensory afferents are a large group of nerves
that will send a lot of different information
from the skin to the brain.
As you can imagine, there’s a lot of information that can
be garnered from our organ that is most externally placed.
It is interacting with the environment all the time.
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.
So let’s go through some of the nerve classes
that are associated with the skin afferents.
Skin tactile receptors are known as alpha beta.
And these have a fairly slow conduction velocity,
although they are still myelinated
about 33 to 75 meters per second.
Alpha delta fibers, these are pain in temperature sensors.
These also have a fairly slow conduction velocity,
5 to 30 meters per second.
But again, these are still myelinated neurons.
And finally, we have our slowest class,
and that’s class C.
These involve things like pain, temperature, each receptors.
These are all very slow unmyelinated neurons
about ½ to 2 meters per second.
So if we compare the alpha beta, alpha delta, and Cs
compare to the muscle spindles and the golgi tendon organs,
you can see that the skin conduction velocities
are very slow in comparison.
So the information is in travel back quite as fast.
But again, you have a lot more
surface area that might be involve.
So you could get a lot more signals
but just not as fast.