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Science 9 May 1980:
Vol. 208. no. 4444, pp. 603 - 605
DOI: 10.1126/science.7367884
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Articles

Science, Vol 208, Issue 4444, 603-605
Copyright © 1980 by American Association for the Advancement of Science

articles

Alteration in connections between muscle and anterior horn motoneurons after peripheral nerve repair

TM Brushart and MM Mesulam

The connections between the spinal cord and lower leg muscles of the rat are significantly altered by repair of the intervening sciatric nerve. Muscles supplied by the peroneal branch of the sciatic are innervated by fewer motoneurons after sciatic repair. Many of these neurons originally innervated the peroneal muscles, and others formerly served the antagonistic tibial muscles. Perikarya in the size range of alpha motoneurons regained peripheral connections with greater frequency than those in the gamma range. There are thus postoperative defects in the extent and specificity of alpha reinnervation as well as in the degree of gamma control.


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