Computer-generated 3-D reconstruction from case R103, after five injections of BDA into the perioral representation of SI. The labeling is located centrally in the right pontine nuclei and consists of two main clusters, the largest located laterally and the smallest medially. The clusters are connected through thin rostral and caudal bridges of fibers that surround a zone devoid of labeling. The sparse contralateral labeling is not shown. Bar = 500 µm.