Koshelev V B, Rodionov I M, Tsorin I B
Experientia. 1979 Feb 15;35(2):204. doi: 10.1007/BF01920617.
The frequency of spontaneous activity of single preganglionic fibres in the cervical sympathetic nerve of sympathectomized and intact animals was compared, and was found to be higher in the sympathectomized group, averaging 5.9 +/- 1.4 pulses per sec, compared with 2.3 +/- 0.5 in the control group.