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Science 20 November 1981:
Vol. 214. no. 4523, pp. 933 - 936
DOI: 10.1126/science.7302570
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Articles

Science, Vol 214, Issue 4523, 933-936
Copyright © 1981 by American Association for the Advancement of Science

articles

Spinal motoneuron recruitment in man: rank deordering with direction but not with speed of voluntary movement

HE Desnedt and E Gidaux

Single motor units in human interosseous muscle are recruited in order from small to large in slow or brisk voluntary abduction of the index finger. When the same muscle acts as a synergist as opposed to a prime mover, about 8 percent of the unit pairs consistently reversed their recruitment order. Motor commands appear to be patterned in terms of movements rather than muscles and to involve different connectivities to the motoneuron pool of a muscle executing movements in different directions.


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