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Journal of Neuroscience, Vol 5, 3350-3369, Copyright © 1985 by Society for Neuroscience
Intrinsic connections of macaque striate cortex: axonal projections of cells outside lamina 4C
GG Blasdel, JS Lund and D Fitzpatrick
We have exploited a technique for making small injections of horseradish
peroxidase into single cortical laminae in order to study axonal
projections in macaque striate cortex. In the preceding paper (Fitzpatrick,
D., J. S. Lund, and G. G. Blasdel (1985) J. Neurosci. 5: 3329-3349) we
examined the projections of cells in lamina 4C--cells that receive most of
their input from the lateral geniculate nucleus. The present paper deals
with the projections of neurons that lie outside of lamina 4C. Among our
findings are several projections that previously had not been described in
the monkey. These include: a strong and precise (point-to-point) projection
from lamina 4B to lamina 2/3A, a reciprocal projection from 2/3A back to
4B, a definite projection from lamina 4B to 5B, as well as a prominent
input to lamina 6 from 5B. In many cases, we find it possible to trace the
flow of visual information through several "circuits" in striate cortex
that have, as their output, projections to extrastriate cortex or to the
brainstem. Our results offer additional insights in this regard since we
are able, in many cases, to compare the lateral spreads of particular
projections. These vary and can be separated into at least three
categories: those that terminate in a precise, point-to-point, fashion,
those that spread widely, and those that terminate in a laterally periodic
fashion. In several cases we find evidence for a correlation between
specific patterns of projection and known physiological differences between
the topographies of laminae that are connected. In cases where two laminae
possess similar topographies (for example, where both contain orderly maps
for orientation) their interconnections appear precise, with little diffuse
spread. In cases where two laminae are characterized by strikingly
different topographies (where, for example, one contains an orderly map for
orientation and the other a precise map for retinotopic position, but no
specificity for orientation), the connections appear more diffuse.
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