PMID: 10972940Sep 6, 2000Paper

Morphology and topographical organization of the retrospleniocollicular connection: a pathway to relay contextual information from the environment to the superior colliculus

The Journal of Comparative Neurology
Gontzal García del CañoLuis Martínez-Millán


The retrospleniocollicular connection is of interest because it constitutes one link between the limbic system, which is considered the anatomical substrate of emotional experience, and the superior colliculus (SC), which mediates approach and avoidance behavior. The morphology, topography, and origin of the retrospleniocollicular connections were studied by using anterograde [biotinylated dextranamine 10,000 (BDA)] and retrograde [Fluoro-Gold (FG)] tracers. After BDA injections involving retrosplenial granular and agranular cortices, terminal fibers innervating all collicular layers except stratum griseum superficiale were found throughout nearly the entire colliculi. Axons branched within restricted portions of the dorsoventral collicular axis with variable morphologies, suggesting functional heterogeneity. Terminal fields originating in anterior and posterior regions of the retrosplenial cortex were preferentially distributed in laterodorsal and medioventral collicular regions, respectively, but there were also large, densely innervated regions in which the terminal fields overlapped. FG injections in the SC confirmed the retrospleniocollicular topography and demonstrated that this connection originated from layer V pyramida...Continue Reading


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