Abstract
The presence of RC's axon running in the dorsal root of the leech Hirudo medicinalis was studied by means of electrophysiological and neuroanatomical techniques. Electrical stimulation of the dorsal root gave invariably the antidromic invasion of the Retzius cell. This effect disappears after crushing the dorsal root between the stimulating electrode and the ganglion, and hence is not due to stimulus spread to the nearby posterior root. Anatomical evidence for an axon collateral running in the dorsal root was provided by catecholamine histofluorescence of the axonal branches of the RCs and by Lucifer Yellow intracellular injection into the RCs.
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