Cerebral Cortex, Vol 7, 422-431, Copyright © 1997 by Oxford University Press
GN Elston, DV Pow and MB Calford
The technique of intracellular injection in fixed, flattened slices was
used to study neuronal composition and morphology in the postero-medial
barrel subfield (PMBSF) and the antero-lateral barrel subfield (ALBSF) in
layer IV of rat cortex. The PMBSF and the ALBSF contain the cortical
representation of the mystacial and rostral snout vibrissae respectively.
Neuronal composition differed between the PMBSF and the ALBSF. Modified
pyramidal cells were the most numerous neuronal type in the PMBSF (73.1%),
whereas spiny multipolar (stellate) neurons were the most numerous type in
the ALBSF (40.9%). Tangential dendritic field areas of modified pyramidal
cells and spiny multipolar cells in the barrels of the two barrel subfields
were compared. Dendritic field areas of spiny multipolar neurons located in
the barrels of the PMBSF and the ALBSF were similar (mean +/- SD; 2.44 +/-
1.83 x 10(4) and 2.88 +/- 1.47 x 10(4) microns2 respectively). Likewise,
there was no significant difference in 'basal' dendritic field area of
modified pyramidal neurons located in the barrels of the two different
barrel subfields (4.63 +/- 1.96 x 10(4) and 4.45 +/- 1.81 x 10(4) microns2
for PMBSF and ALBSF respectively). The mean cross-sectional area of PMBSF
barrels (20.5 +/- 5.69 x 10(4) microns2) in which neurons were injected was
approximately seven times larger than that of the ALBSF (2.94 +/- 1.46 x
10(4) microns2). Thus, on average, the dendritic territories of these two
neuronal classes sample a larger proportion of the cross- sectional area of
the barrels in the ALBSF than in the PMBSF. We conclude that the close
relationship between basal dendritic field area of supragranular pyramidal
neurons and module size, reported in studies of other sensory areas, is not
evident in all barrel subfields of the rat.
ARTICLES
Neuronal composition and morphology in layer IV of two vibrissal barrel subfields of rat cortex
Department of Physiology and Pharmacology, University of Queensland, Australia.
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