Impulse discharges of the efferent and afferent nerves in the nerve bundles from the 9th ganglion were recorded by means of silver wire electrode, RC amplifier and cathode-ray oscilloscope. The result were as follows:
(1) Activities of efferent nerve were controlled by sensory inputs.
(2) Endogenous discharge of impulses in efferent fibers from the neurally isolated 9th ganglion showed regular, rhythmic firing. In this condition, spike potentials were observed in only a few definite fibers in each bundle. Sometimes the rhythm was never perfectly regular, but the pattern in a sequence of impulse bursts in different preparation was still sufficiently characteristic to mark their common origin.
(3) Light stimulation caused reflex discharge of nerve fibers in all bundles. The reflex pattern in the individual fibers varied from moment to moment.
(4) All bundles except the sympathetic ones contained the afferent fibers. Most of the afferent fibers of n1 were from the tactile hairs on the labia. And it was assumed that most of the afferent fibers of n2, n3, n4, n5, n6 and n7 were from muscle stretch receptors (proprioceptors).