The convergence of sympathetic preganglionic fibres on vasomotor neurones of the ganglia in lumbar sympathetic chain.
By means of intracellular recordings from the neurones of isolated L(3)-L(6) ganglia it was shown that B(1)-, B(2)- and C-preganglionic fibres widely converge on these neurones. Besides, a part of the ganglionic neurones is activated by slow-conducting C-fibres coming into the ganglia through the grey rami. Identified vasomotor neurones have the distinctive feature of preganglionic fibre convergence. Only B(2)- and C-preganglionic fibres were able to activate them, but the efficacy of the B(2)-fibre excitatory action is considerably higher.
Lebedev
V P
VP
Laboratory of Circulation, I.P. Pavlov Inatitute of Physiology, The Academy of Sciences of the U.S.S.R., Leningrad 199164 U.S.S.R.
Syromiatnikov
A V
AV
Skok
V I
VI