[Afferent thalamic projections in the dog brain pallidal structures].

Distribution of labelled neurons in thalamic nuclei after the marker injection into the dog brain pallidal structures (globus pallidum, entopeduncular nucleus and ventral pallidum) was studied by retrograde axonic HRP and fluorochrome transport. Analysis of the material obtained allowed to conclude that in globus pallidum projections from motor thalamic nuclei (ventral anterior, ventral lateral, ventral medial and median centre) are dominating, although in ventral pallidum projections from limbic nuclei (parafascicular and median) are predominant. Entopeduncular nucleus receives projections from functionally different thalamic nuclei (intralaminar and nuclei of ventral and posterior groups). It is obvious that both segregated transmission of functionally specific information and possibility of its convergence at the level of pallidum might occur in organization of thalamo-palidal projections.