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The muscle spindle detects changes in muscle length. A. The main components of the muscle spindle are intrafusal muscle fibers, afferent sensory endings, and efferent motor endings. The intrafusal fibers are specialized muscle fibers with central regions that are not contractile. Gamma motor neurons innervate the contractile polar regions of the intrafusal fibers. Contraction of the polar regions pulls on the central regions of the intrafusal fiber from both ends. The sensory endings spiral around the central regions of the intrafusal fibers and are responsive to stretch of these fibers. (Adapted, with permission, from Hulliger 1984.) B. The muscle spindle contains three Principles types of intrafusal dynamic Source: Spinal Reflexes, of Neuralfibers: Science, Fifth nuclear Editon bag, static nuclear bag, and nuclear chain fibers. A single Ia sensory axon innervates all three types of fibers, forming a primary sensory ending. Type II sensory axons innervate the nuclear chain fibers and static bag fibers, Citation: Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Fifth Editon; 2012 Available forming a secondary sensory ending. Two types of motor neurons innervate different intrafusal fibers. Dynamic gamma motor neurons innervate only at: http://mhmedical.com/ Accessed: May 13, 2017 dynamic bag fibers; static gamma motor neurons innervate various combinations of chain and static bag fibers. (Adapted, with permission, from Boyd Copyright © 2017 McGraw-Hill Education. All rights reserved 1980.)