A fast propriospinal inhibitory pathway from forelimb afferents to motoneurones of hindlimb flexor digitorum longus.
In high spinalized cats the propriospinal effects of forelimb afferents upon 145 motoneurones of seven different flexor and extensor hindlimb muscles were investigated with intracellular recording. All types of motoneurones showed late (latency longer than 6 msec) excitatory or mixed excitatory-inhibitory effects to forelimb nerve stimulation. Only in flexor digitorum and hallucis longus (FDL) motoneurones were distinct effects with shorter latencies observed, which, however, were exclusively inhibitory. The IPSPs were evoked from cutaneous and muscle afferents and had a minimal central latency of 3.1 msec. They were probably mediated via a trisynaptic pathway.
Schomburg
E D
ED
Physiologisches Institut II der Universität Göttingen, 3400 Göttingen, G.F.R.
Meinck
H M
HM
Haustein
J
J