Abstract

Afferent sources from meso-diencephalon to n. raphe magnus (RM) were examined by the HRP method. Following HRP injection into RM, HRP-labeled cell clusters occured in:(1) n.linealis rostralis; (2) ventrocaudal parts of n.parafascicularis; (3) zona incerta; and (4) midbrain reticular formation. As a rule, the axons from (1) and (4) mainly terminate within RM, while those from (2) and (3) seem to project to the inferior olive (IO) as well as RM. The functional significance of these nuclei is briefly discussed.

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