Axon reflexes in spinal dorsal roots.

The existence of branching of myelinated dorsal root axons has been shown with electrophysiological techniques. The point at which the axons branch is several mm proximal to the ganglion. This observation may be relevant to the interpretation of studies which use spike-triggered averaging to investigate the pattern and the extent of the distribution of sensory information from primary afferent fibers to second-order neurons.