Cerebral Cortex, Vol 8, 543-552, Copyright © 1998 by Oxford University Press
L Tettoni, F Gheorghita-Baechler, R Bressoud, E Welker and GM Innocenti
In order to determine to what extent the terminal arbors of
phylogenetically and functionally distant axons are constructed according
to common rules, we have compared visual callosal axons in cats (CCC axons)
with thalamocortical axons to the whisker representation in mice (MTC
axons). Both similarities and differences were found. Maximal order of
branching, branching angles, topological distribution of branches and
boutons are similar for all axons, indicating strong constraints in arbor
formation. CCC and MTC axons are indistinguishable for total arbor length
and number of branches, although these parameters can vary across
individual axons of each group. MTC axons have longer and bouton-richer
end-branches (the 'transmission compartment') while, in CCC axons,
proximal, boutonless branches (the 'conduction compartment') predominate.
Therefore, the two classes of axons appear to be specialized for performing
different types of operations, in agreement with the available
electrophysiological data and computer simulations. Differences in the
length of branches were also observed between MTC axons of normal and
'barrelless' mice, suggesting that this parameter can be regulated by
conditions at the terminal sites.
Constant and variable aspects of axonal phenotype in cerebral cortex
Institut de Biologie Cellulaire et de Morphologie, Universite de Lausanne, Switzerland.
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