221 66 66 2 2 C. Baleydier F. Mauguière Laboratoire de Neuropsychologie Expérimentale INSERM-U94 16 Avenue du Doyen Lépine F-69500 Bron France Laboratoire de Neurophysiologie Sensorielle, Appliquée à la Clinique, Faculté de Médecine Lyon-Nord Hôpital Neurologique 59 Boulevard Pinel F-69003 Lyon France Summary The topographic distribution of medial pulvinar neuronal populations projecting to area 7a and to posterior cingulate gyrus (area 23) was investigated with retrograde axonal transport of fluorescent dyes. In an initial stage, separate injections of fast blue and diamidino-yellow were placed in area 7a. Two segregated backfilled cell populations were observed in the cingulate gyrus revealing a topographic distribution of cortico-cortical connections. In a second stage, the two dyes were injected in area 7a and in the posterior cingulate gyrus. After injections in two cortical sub-areas previously shown to be in topographic correspondence, the two projecting populations observed in the medial pulvinar over-lapped extensively. In the case of injections in two regions not topographically correspondent, the two medial pulvinar populations were found to be segregated. These findings reveal that within both posterior parietal cortex and posterior cingulate gyrus, sub-areas which are in topographic correspondence receive projections from a common region of the medial pulvinar.
Experimental Brain Research – Springer Journals
Published: Apr 1, 1987
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