Cutaneous Sensory Afferents

by Thad Wilson, PhD

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    00:01 Cutaneous Sensory Afferents.

    00:04 Cutaneous sensory afferents are a large group of nerves that will send a lot of different information from the skin to the brain.

    00:13 As you can imagine, there’s a lot of information that can be garnered from our organ that is most externally placed.

    00:22 It is interacting with the environment all the time.

    00:25 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.

    00:38 So let’s go through some of the nerve classes that are associated with the skin afferents.

    00:46 Skin tactile receptors are known as alpha beta.

    00:51 And these have a fairly slow conduction velocity, although they are still myelinated about 33 to 75 meters per second.

    01:00 Alpha delta fibers, these are pain in temperature sensors.

    01:05 These also have a fairly slow conduction velocity, 5 to 30 meters per second.

    01:11 But again, these are still myelinated neurons.

    01:14 And finally, we have our slowest class, and that’s class C.

    01:19 These involve things like pain, temperature, each receptors.

    01:23 These are all very slow unmyelinated neurons about ½ to 2 meters per second.

    01:31 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.

    01:44 So the information is in travel back quite as fast.

    01:48 But again, you have a lot more surface area that might be involve.

    01:52 So you could get a lot more signals but just not as fast.

    About the Lecture

    The lecture Cutaneous Sensory Afferents by Thad Wilson, PhD is from the course Neurophysiology.

    Author of lecture Cutaneous Sensory Afferents

     Thad Wilson, PhD

    Thad Wilson, PhD

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