B. The discharge rate in the Ia sensory fiber of a spindle increases during slow flexion of a finger. This increase depends on alpha-gamma co-activation.

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B. The discharge rate in the Ia sensory fiber of a spindle increases during slow flexion of a finger. This increase depends on alpha-gamma co-activation. If the gamma motor neurons were not active, the spindle would slacken, and its discharge rate would decrease as the muscle shortened (see Figure 35–9C). (Adapted, with permission, from Vallbo 1981.) Source: Spinal Reflexes, Principles of Neural Science, Fifth Editon Citation: Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Fifth Editon; 2012 Available at: http://neurology.mhmedical.com/DownloadImage.aspx?image=/data/books/1049/kan_ch35_f012.png&sec=59143973&BookID=1049&ChapterSecID=59138665&imagename= Accessed: December 27, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved

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