NDLI: Ontogeny of Corticocortical Projections of Rat Somatosensory Cortex

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Ontogeny of Corticocortical Projections of Rat Somatosensory Cortex

Content Provider	Scilit
Author	Nicolelis, Miguel A. L. Chapin, John K. Lin, Chia-Sheng
Copyright Year	1991
Description	Rhodamine-coated microspheres (RCMs) were injected into the primary somatosensory cortex (SI) of rats ranging in age from postnatal (PN) day to adulthood. Ipsilateral corticocortical and callosal projections within the SI were identified as early as PN day 1. At the end of the first PN week, ipsilaterally projecting neurons located in sublayer VIb were the first to assume an adult-like pattern of connectivity. Injections at subsequent postnatal ages revealed that an adult pattern of lamination of ipsilateral corticocortical projections within the SI is established between PN weeks 2 and 3, comprising projection neurons from layers II/IH, layer V, and sublayer VIb. Therefore, local interactions in the rat SI are mediated not only by pyramidal neurons of layers III and V, derived from the cortical plate, but also by a subpopulation of ontogenetically older neurons located in the sublayer VIb, which may correspond to the subplate neurons of other species. Overall, these results suggest the existence of three independent short-range corticocortical systems of projections within the rat SI, which differ in terms of the laminar distribution and ontogenetic origin of their cells.
Related Links	http://www.tandfonline.com/doi/pdf/10.3109/08990229109144743
Ending Page	200
Page Count	8
Starting Page	193
ISSN	08990220
e-ISSN	13691651
DOI	10.3109/08990229109144743
Journal	Somatosensory & motor research
Issue Number	3
Volume Number	8
Language	English
Publisher	Informa UK Limited
Publisher Date	1991-01-01
Access Restriction	Open
Subject Keyword	Journal: Somatosensory & Motor Research Neurosciences Ontogeny Corticocortical Projections Rat Somatosensory Cortex
Content Type	Text
Resource Type	Article
Subject	Physiology Sensory Systems

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