Abstract: One hundred and eighty two neurons were recorded from S₁ spinal ganglion in 30 rats.Of them, 74 neurons responded to stimulation of both pudendal(Pu)and pelvic(Pe)nerve.Conduction velocity of action potentials induced by Pu stimulation (38.07 m/s) was significantly faster than that of Pe stimulation induced ones (21.84 m/s).The action potentials evoked by Pu and Pe stimulation could be collided each another.These results indicate that somatic and visceral input may converge on single type A spinal ganglion neurons via dichotomizing primary afferents.

Key words: spinal ganglion, pelvic nerve, pudendal nerve, intracellular recording, afferent converge, rat