Which of the following excites the polar regions of the muscle - ProProfs Discuss
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Which of the following excites the polar regions of the muscle spindle?



A. Unmyelinated C fibers
B. 1A fibers
C. Gamma motor neurons
D. Alpha motor neurons
E. General visceral efferent fibers
Asked by Dalston, Last updated: Jan 12, 2020

This question is part of

USMLE step 1 Qs (10)

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2 Answers

L. Hawkes

L. Hawkes, Teacher, Memphis

Answered Feb 14, 2019

The correct answer to this question is C. A gamma motor neuron is a lower neuron that is a part of muscle contraction and is about 30% of the fibers that leave the spinal cord and go to the...Read More
 

John Smith

John Smith

Answered Sep 08, 2016

Gamma motor neurons -gamma motor neurons innervate the polar regions of the muscle spindle and, when excited, cause resetting of the spindle by stretching it, resulting in a lowering of the...Read More
 

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