PMID: 3745020Jan 1, 1986Paper

Columnar organization and reciprocity of commissural connections in cat primary auditory cortex (AI)

Hearing Research
R A Code, Jeffery A Winer

Abstract

The laminar distribution and reciprocity of commissural axon terminals and cells of origin in cat primary auditory cortex (AI) were studied after injections of tritiated proline combined with horseradish peroxidase in the middle ectosylvian gyrus. Terminal fields were found in every cortical layer in the contralateral AI, and they were characterized quantitatively. The largest concentration of silver grains was in layer III (about 25% of the total number of silver grains) and, to a lesser extent, in layers V, VI, and I (some 18% of the total in each layer). The labeling in layer I was concentrated in its deeper half, while the labeling in the other layers was more homogeneous. Layer IV had the least labeling, followed by layer II, each receiving about 10% of the total. The labeling was always heaviest over the neuropil and lightest over neuronal perikarya. Commissural terminal fields formed radial patches oriented perpendicularly to the pia, and averaging 543 micron in width. There was consistently three times more silver grains in a patch than in an inter-patch area. However, the number of silver grains in an inter-patch area was always significantly above background, indicating a possible commissural projection to these zones...Continue Reading

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Citations

Feb 10, 1999·The Journal of Comparative Neurology·J J Prieto, J A Winer
Apr 2, 1999·The European Journal of Neuroscience·T A HackettJ H Kaas
Mar 9, 2010·PloS One·Craig A Atencio, Christoph E Schreiner
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May 12, 2021·Ear and Hearing·Jolie L ChangSteven W Cheung

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