Computer-generated 3-D reconstruction from case R113, after injection of BDA into the upper lip representation of SI. The labeling is located centrally in the right pontine nuclei and consists of a large laterally located cluster and a smaller medially located cluster. 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.