On the basis of dichotomizing projection of the peripheral processes of the spinal ganglion cells to both the intercostal nerves and viscera(such as stomach and so on) in rats

the evoked potential was recorded from the ipsilateral greater splanchnic nerve after electrostimulating the left T_(10) intercostal nerve

the roots of which had been cut. Result: the complex action potential

the mean conduction velocity of which was 12. 40m/sec

was recorded

the result was not influenced by paralysis of respiratory muscles

but lost after anesthesia of the intercostal nerve or greater splanchnic nerve. These findings suggest that neural impulse can conduct from the somatic branches

which go through the intercostal nerve

of the peripheral process of the spinal ganglion cells to the visceral ones

which pass through the greater splanchnic nerve

these branches are mainly A-a fibers.