Origin of ascending and spinal pathways from the nucleus tegmenti pedunculopontinus in the rat

The distribution and collaterlization of ascending and descending projections from neurons in the nucleus tegmenti pedunculopontinus (PPN) were studied in the rat by using retrograde transport of HRP, HRP/WGA, and fluorescent dyes. The PPN and its two subdivisions, the subnucleus compactus (PPNc) and subnucleus dissipatus (PPNd), were delineated on sagittal Nisslstained sections by using cytoarchitectural features as guidelines.

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