Abstract
A method based on retrograde axonal transport was used to undertake detailed studies of the efferent projections of individual substructures of the pedunculopontine nucleus of the midbrain tegmentum to functionally diverse segments of striatal structures in dogs. The compact and diffuse zones of this nucleus were found to project to segments of the putamen, caudate nucleus, and nucleus accumbens, which are components of the limbic and motor systems. The medial part of the diffuse zone, adjacent to the decussation of the superior cerebellar peduncles (presumptively the mesencephalic extrapyramidal field) projected only to the dorsal segments of the caudate nucleus and putamen, which are parts of the motor system.
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