Question 13 / 59:  If you shock the gamma efferent motor axons innervating a muscle, what would you record from the muscle's spindle afferents?

If the reflex loop is intact, what would you record from the alpha motor axons innervating the same muscle? Why? (2 points)

Answer: 

The gamma efferents cause contraction of the muscle spindle, which is the equivalent of stretch.

Thus the afferents would increase their firing.

These synapse on the alpha motor neurons, which fire to contract the muscle.

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Introduction to Neuroscience Exam #3 (HST.131)

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Attribution:  Corey, David. HST.131 Introduction to Neuroscience, Fall 2005. (MIT OpenCourseWare: Massachusetts Institute of Technology), http://ocw.mit.edu/courses/health-sciences-and-technology/hst-131-introduction-to-neuroscience-fall-2005 (Accessed 12 Apr, 2014). License: Creative Commons BY-NC-SA
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