Editing 20110105 Lecture 4 notes.txt
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*There are collagen fibers that squish the free nerve endings such that the stretch receptors are activated, vgna channels are activated, and an AP is fired. | *There are collagen fibers that squish the free nerve endings such that the stretch receptors are activated, vgna channels are activated, and an AP is fired. | ||
- | ===Primary sensory afferents | + | ===Primary sensory afferents innervatinghuman skin=== |
*There are several different types of afferent ("at" the cns) fibers for communicating sensation back to the CNS. | *There are several different types of afferent ("at" the cns) fibers for communicating sensation back to the CNS. | ||
*a-alpha | *a-alpha | ||
**For proprioceptors | **For proprioceptors | ||
- | |||
*a-beta | *a-beta | ||
**myelinated | **myelinated | ||
- | **for touch or | + | **for touch or mechanosensitive |
**some proprioception | **some proprioception | ||
*a-gamma | *a-gamma | ||
**Motor to intrafusal fibers | **Motor to intrafusal fibers | ||
- | |||
*a-delta | *a-delta | ||
**sensation of sharp pain | **sensation of sharp pain | ||
**called stimuli | **called stimuli | ||
**some touch receptors | **some touch receptors | ||
- | |||
*All a-fibers are myelinated | *All a-fibers are myelinated | ||
*b | *b |