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Journal of Neuroscience, Vol 14, 6301-6316, Copyright © 1994 by Society for Neuroscience
Territorial organization of direction-selective ganglion cells in rabbit retina
DI Vaney
Department of Physiology and Pharmacology, University of Queensland, Brisbane, Australia.
The On-Off direction-selective (DS) ganglion cells in the rabbit retina
comprise four discrete subtypes that orthogonally code the direction of
image motion. This study examined the dendritic relationships between
different subtypes of On-Off DS cells, which were identified by their
distinctive type 1 bistratified (BiS1) morphology following the
intracellular injection of a biotinylated tracer or Lucifer yellow under
direct microscopic control. The dendrites of BiS1 cells that had closely
spaced somata, which presumably comprised subtypes of On-Off DS cells with
different preferred directions, were not randomly superimposed but were
fasciculated into loose bundles. By contrast, tracer coupling revealed that
neighboring On-Off DS cells of one subtype were highly territorial,
providing complete coverage of the retina with minimal overlap. This
mirrors, on a larger scale, the territorial organization within the
dendritic tree of individual DS cells, suggesting that similar interactions
shape both the branching pattern and the spatial extent of these neurons.
Moreover, the dendrites at the edge of the dendritic field often formed
tip-to-shaft or tip-to-tip contacts with dendrites from coupled cells, thus
appearing to form closed dendritic loops that may be equivalent to those
found within the dendritic tree. Consequently, the dendrites of one subtype
are distributed uniformly and economically across the retina. The resulting
plexus forms a strikingly regular scaffold on which the presynaptic
interneurons generate direction selectivity.
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