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Journal of Neuroscience, Vol 13, 5365-5382, Copyright © 1993 by Society for Neuroscience
Organized growth of thalamocortical axons from the deep tier of terminations into layer IV of developing mouse barrel cortex
A Agmon, LT Yang, DK O'Dowd and EG Jones
Department of Anatomy, University of California, Irvine 92717.
The thalamocortical projection to rodent somatosensory ("barrell") cortex
is highly ordered in both the radial and the tangential dimensions. During
a brief period of postnatal development, thalamocortical axons establish
two tiers of terminations, in the deep layers and in layer IV, and form
whisker-specific clusters within layer IV; however, little is known about
the cues that guide them to their appropriate radial and tangential
positions. To gain insight into potential mechanisms underlying this
process, we studied the development of thalamocortical termination patterns
in mouse barrel cortex at high spatial resolution. Developing
thalamocortical axons were labeled in fixed slices with the lipophilic
carbocyanine dye Dil and imaged with a laser scanning confocal microscope.
On the day of birth (postnatal day 0, P0) axons coursed through layers VI
and V, with little or no branching. By P2 the lower tier of terminations,
at the border of layers VI and V, was clearly identifiable. Below this tier
axons coursed obliquely or tangentially, forming a dense meshwork of
intersecting fibers, but with no apparent branching. By P4 the upper tier
of terminations, in layer IV, was clearly recognizable, and consisted of
periodic, dense clusters of terminal arborizations. In marked contrast to
the oblique and apparently disorderly course followed by axons in layer VI
and lower layer V, axons in upper layer V heading toward the upper tier
were organized in loose bundles running radially, suggesting that axons
destined to terminate in a particular layer IV barrel had already reached
their appropriate tangential coordinates within the lower tier. Thus, the
pattern of thalamocortical terminations in layer IV seems to be projected
from the deep tier of terminations, and does not develop from an initially
profuse arborization pattern through pruning of inappropriate branches.
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