Abstract
A method is described for recording from single unit afferents from spindles in jaw closing muscles of the normally behaving cat. The spindle discharge is partly or completely suppressed during active muscle shortening in chewing and lapping. In the lengthening phase, it can reach 120 imp./sec in some units (believed secondaries) and 220–400 imp./sec in others (believed primaries). There is clear evidence of fluctuating fusimotor drive accompanying muscle contraction, in some cases timed to maintain almost constant afferent frequency. There is considerable variability in the relation of fusimotor to α motor drive and this is discussed in relation to control theory with reference to optimal systems.
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