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Contrasting Patterns of Cortical Input to Architectural Subdivisions of the Area 8 Complex: A Retrograde Tracing Study in Marmoset Monkeys

机译:皮质输入与区域8建筑群建筑分区的对比模式:Mar猴的逆行追踪研究

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摘要

Contemporary studies recognize 3 distinct cytoarchitectural and functional areas within the Brodmann area 8 complex, in the caudal prefrontal cortex: 8b, 8aD, and 8aV. Here, we report on the quantitative characteristics of the cortical projections to these areas, using injections of fluorescent tracers in marmoset monkeys. Area 8b was distinct from both 8aD and 8aV due to its connections with medial prefrontal, anterior cingulate, superior temporal polysensory, and ventral midline/retrosplenial areas. In contrast, areas 8aD and 8aV received the bulk of the projections from posterior parietal cortex and dorsal midline areas. In the frontal lobe, area 8aV received projections primarily from ventrolateral areas, while both 8aD and 8b received dense inputs from areas on the dorsolateral surface. Whereas area 8aD received the most significant auditory projections, these were relatively sparse, in comparison with those previously reported in macaques. Finally, area 8aV was distinct from both 8aD and 8b by virtue of its widespread input from the extrastriate visual areas. These results are compatible with a homologous organization of the prefrontal cortex in New and Old World monkeys, and suggest significant parallels between the present pathways, revealed by tract-tracing, and networks revealed by functional connectivity analysis in Old World monkeys and humans.
机译:当代研究发现,在尾前额叶皮层的Brodmann区域8复合体中有3个不同的细胞结构和功能区域:8b,8aD和8aV。在这里,我们通过在mar猴中注射荧光示踪剂来报告这些区域的皮质投影的定量特征。区域8b与8aD和8aV都不相同,因为它与内侧前额叶,前扣带回,颞上多感觉区和腹中线/后脾区相连。相反,区域8aD和8aV接收了来自顶叶后皮质和背中线区域的大部分投影。在额叶中,区域8aV主要从腹侧区域接收投影,而区域8aD和8b都从背外侧表面接收密集输入。尽管8aD区域的听觉预测最为显着,但与先前在猕猴中报告的相比,这些预测相对稀疏。最终,区域8aV由于来自超视域的广泛输入而不同于8aD和8b。这些结果与新旧猴子中前额叶皮层的同源组织相容,并暗示了通过迹线追踪揭示的当前途径与旧大陆猴子和人类的功能连通性分析揭示的网络之间存在显着的相似性。

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