Abstract
Pyramidal cell structure varies systematically in occipitotemporal visual areas in monkeys. The dendritic trees of pyramidal cells, on average, become larger, more branched and more spinous with progression from the primary visual area (V1) to the second visual area (V2), the fourth (V4, or dorsolateral DL visual area) and inferotemporal (IT) cortex. Presently available data reveal that the extent of this increase in complexity parallels the expansion of occipitotemporal cortex. Here we extend the basis for comparison by studying pyramidal cell structure in occipitotemporal cortical areas in the chacma baboon. We found a systematic increase in the size of and branching complexity in the basal dendritic trees, as well as a progressive increase in the spine density along the basal dendrites of layer III pyramidal cells through V1, V2 and V4. These data suggest that the trend for more complex pyramidal cells with anterior progression through occipitotemporal visual areas is not a feature restricted to monkeys and prosimians, but is a widespread feature of occipitotemporal cortex in primates.
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Acknowledgments
This work was supported by the McDonnell Foundation, the Australian National Health and Medical Research Council (GNE) and the Spanish Ministry of Science and Technology (DGCYT PM99-0105 and BFI 2003–02745), the Comunidad Autonoma de Madrid (01/0782/2000) and the South African National Research Foundation.
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Elston, G.N., Benavides-Piccione, R., Elston, A. et al. Pyramidal cell specialization in the occipitotemporal cortex of the Chacma baboon (Papio ursinus). Exp Brain Res 167, 496–503 (2005). https://doi.org/10.1007/s00221-005-0057-3
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DOI: https://doi.org/10.1007/s00221-005-0057-3