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Journal of Neuroscience, Vol 9, 1389-1399, Copyright © 1989 by Society for Neuroscience
Local circuits and ocular dominance columns in monkey striate cortex
LC Katz, CD Gilbert and TN Wiesel
Laboratory of Neurobiology, Rockefeller University, New York, New York 10021.
The relationships between ocular dominance columns and intrinsic cortical
circuitry were examined in brain slices prepared from the striate cortex of
macaques. Ocular dominance columns in layer 4C beta were visualized in
vitro following anterograde transport of rhodamine injected into the
lateral geniculate nucleus in vivo. The axonal and dendritic arborizations
of individual layer 4C beta cells were revealed by intracellular
fluorescent dye injections. Both qualitative observations and quantitative
analysis showed that the dendrites of cells close to borders remained
preferentially, although not absolutely, in the "home" column (the column
containing the cell body). Thus, the segregated pattern of afferent input
appears to have considerable influence on the pattern of dendritic arbors.
Similarly, while axon collaterals within layer 4C beta could cross into the
adjacent column, their limited lateral spread produced arbors that remained
primarily within the home column. The terminal arbors of collaterals that
travelled from layer 4C beta to layer 3 had a larger lateral spread, and
the termination pattern appeared to be independent of column borders. Thus,
our observations indicate that, while the course of many layer 4C beta
dendrites appears to be guided by columnar boundaries as defined by
geniculate afferents, there exist morphological substrates for
intercolumnar interactions even between 4C beta cells. Intercolumnar
interactions are seen more commonly in layer 3, however, where larger,
denser axon arbors originating from 4C beta cells can freely cross ocular
dominance column boundaries.
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