[Influence of peripheral process branching in nerve of spinal ganglion on the primary afferent impulse]

In order to observe the electrical and morphological characteristics of neurons in toad spinal ganglion (SG) preparation, microelectrode filled with 0.75% horseradish peroxidase (HRP) was used both for intracellular recording and for intracellular labelling. Histological result showed that there were apparent branchings in peripheral process of A type cells. Intra-axonal recording of the discharges of dorsal root fiber could be evoked by simultaneous stimulation of two separate fine bundles in spinal nerve. The discharging event exhibited the patterns of interruption, default and addition. The above results suggest that the peripheral process branching might alter the array and frequency of primary sensory afferent input.