C. Selective stimulation of the two types of gamma motor neurons has different effects on the firing of the Ia fibers from the spindle. Without gamma stimulation.

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Michael S. Beauchamp, Ph.D. Assistant Professor Department of Neurobiology and Anatomy University of Texas Health Science Center at Houston Houston, TX.

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C. Selective stimulation of the two types of gamma motor neurons has different effects on the firing of the Ia fibers from the spindle. Without gamma stimulation the Ia fiber shows a small dynamic response to muscle stretch and a modest increase in steady-state firing. When a static gamma motor neuron is stimulated, the steady-state response of the Ia fiber increases, but there is a decrease in the dynamic response. When a dynamic gamma motor neuron is stimulated, the dynamic response of the Ia fiber is markedly enhanced, but the steady-state response gradually returns to its original level. (Adapted, with permission, from Brown and Matthews 1966.) 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_f003.png&sec=59143908&BookID=1049&ChapterSecID=59138665&imagename= Accessed: October 01, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved