Table 1.

Comparison of proportions of dh DSCT, CC DSCT, and SCT neurons with proportions of VSCT neurons in which PSPs were evoked from motor nuclei

	From Within Motor Nuclei
	VSCT	dh DSCT	CC DSCT	SCT	From Outside SCT
n	133	33	22	28	20
IPSPs latency ranges (ms) (%)
0.7–3.0	88	88	81	0	86
0.7–1.4	73	3	54	0	3
1.4–3.0	65	85	23	0	70
EPSPs latency ranges (ms) (%)
0.7–3.0	65	64	0	0	55
0.7–1.4	48	12	0	0	42
1.4–3.0	43	55	0	0	12

PSPs evoked by stimuli applied in motor nuclei are grouped depending on the latencies of their earliest components. The range of 0.7–1.4 ms is compatible with monosynaptic coupling, whereas PSPs evoked at 1.4–3.0 ms would include those evoked di- and trisynaptically but possibly also some monosynaptically (see discussion). The data are for PSPs evoked by stimuli ≤50 μA but negative results were verified using stimuli of 100 μA. For details of data on VSCT neurons see Jankowska et al. (2010). VSCT, ventral spinocerebellar tract; DSCT, dorsal spinocerebellar tract dh DSCT, dorsal horn DSCT; CC DSCT, DSCT located in Clarke's column; SCT, spinocervical tract.