Abstract
The central projections of the nervous branches supplying the rabbit's concha auriculae have been determined by means of the transganglionic transport of WGA-HRP. Labeling appeared in trigeminal, C2 and C3 ganglion cells, but terminals were observed only at spinal levels (C2 and C3). There, they formed a wedge-shaped column of label centered mainly in lamina II; scattered terminals appeared in lamina III and I. These terminals constitute the afferent link of the pathway that accounts for the analgesia obtained after electrical stimulation of the concha auriculae.
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