Computer-generated 3-D reconstruction from case M27, in which BDA and FR was injected in corresponding whisker representations in SI and MI, respectively. Adjacent, partially overlapping clusters of labeling are observed within the ipsilateral pontine nuclei. The labeled clusters together form a ring-like volume in the pontine nuclei. Sparse labeling is observed medially in the contralateral pontine nuclei. Scale bars, 500 µm.