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J Neurophysiol 44: 696-712, 1980;
0022-3077/80 $5.00
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Journal of Neurophysiology, Vol 44, Issue 4 696-712, Copyright © 1980 by APS

ARTICLES

Tetrapartite classification of motor units of cat tibialis posterior

J. C. McDonagh, M. D. Binder, R. M. Reinking and D. G. Stuart

The results of this study and its precedents suggest that the tetrapartite classification scheme might have universal applicability to at least the muscle units of cat hindlimb muscles and perhaps any mammalian muscle in which fiber typing reveals the presence of FG, FI, FOG, and type SO fibers. A possible exception to this generalization involves a small (n = 18) but thoroughly examined sample of muscle units from the first deep lumbrical muscle of the cat's foot, which led Kernell et al. (30) to conclude that the FF, FR, and S classification scheme was not directly applicable to that muscle. However, histochemical fiber typing is not yet available for that muscle. Furthermore, more extensive sampling, use of a different stimulation regime in the fatigue test, and a more detailed analysis of the sag property might well reveal that the tetrapartite classification scheme is indeed appropriate for units of cat foot muscles.


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