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- W2031077791 abstract "Focal injections of horseradish peroxidase (HRP) in dimethylsulfoxide (DMSO) were targeted into mouse somatosensory cortex, in vitro, with a template. Injections were made at different depths and in different locations in the whisker-barrel-defined somatosensory map in order to determine quantitative connectivity patterns within and between barrel-defined cortical columns. Cortices were sectioned in a plane parallel to the pia at 75 βm. Data were collected directly from microscope slides by computer. Data are presented as: (1) Plots of computer-mapped HRP reaction product density in neurons and cell locations for each section in relation to barrel boundaries; (2) histograms of label in cortical layers related to individual barrel-defined columns; (3) polar plots of relative amounts of label within individual barrel columns in sections through each barrel column; (4) vectors which represent HRP reaction product density as a function of direction and distance from the injection site; (5) statistical analysis of the shape of the label distribution pattern in the plane of the cortex as a function of injection site depth; and (6) probability of labeling of any other barrel column given a labeled barrel column. The principal findings are: (1) The pattern of label distribution, after an injection directly above or directly below an individual barrel, is hour-glass shaped with the waist of the hour-glass in layer IV. (2) Connections within barrel cortex are asymmetrical. Barrel-related columns within a row are more strongly interconnected than those in different rows. (3) Connections of the small barrels associated with whiskers on the upper lip are strongest with other small barrels, but strong connections also exist between these small barrels and the larger barrels. (4) The pattern of intracortical connections in SII is not asymmetrical; interlaminar connections in SII are fundamentally different from those in barrel cortex. (5) Quantitative intracortical projection patterns are highly consistent with functional data on intracortical processing of whisker information. As such, the quantitative data clearly indicate the spatial extent and relative magnitude of populations of neurons involved in intracortical processing of sensory information. The spatial arrangements of these intracortical connections, in conjunction with known developmental events, make it highly likely that the distribution of intracortical axons in mouse barrel cortex is sculpted in part by experience." @default.
- W2031077791 created "2016-06-24" @default.
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- W2031077791 date "1990-01-08" @default.
- W2031077791 modified "2023-10-01" @default.
- W2031077791 title "Local intra- and interlaminar connections in mouse barrel cortex" @default.
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- W2031077791 doi "https://doi.org/10.1002/cne.902910207" @default.
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