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Open Access 01-04-2017 | Original Article

Axon topography of layer 6 spiny cells to orientation map in the primary visual cortex of the cat (area 18)

Authors: Fuyuki Karube, Katalin Sári, Zoltán F. Kisvárday

Published in: Brain Structure and Function | Issue 3/2017

Abstract

To uncover the functional topography of layer 6 neurons, optical imaging was combined with three-dimensional neuronal reconstruction. Apical dendrite morphology of 23 neurons revealed three distinct types. Type Aa possessed a short apical dendrite with many oblique branches, Type Ab was characterized by a short and less branched apical dendrite, whereas Type B had a long apical dendrite with tufts in layer 2. Each type had a similar number of boutons, yet their spatial distribution differed from each other in both radial and horizontal extent. Boutons of Type Aa and Ab were almost restricted to the column of the parent soma with a laminar preference to layer 4 and 5/6, respectively. Only Type B contributed to long horizontal connections (up to 1.5 mm) mostly in deep layers. For all types, bouton distribution on orientation map showed an almost equal occurrence at iso- (52.6 ± 18.8 %) and non-iso-orientation (oblique, 27.7 ± 14.9 % and cross-orientation 19.7 ± 10.9 %) sites. Spatial convergence of axons of nearby layer 6 spiny neurons depended on soma separation of the parent cells, but only weakly on orientation preference, contrary to orientation dependence of converging axons of layer 4 spiny cells. The results show that layer 6 connections have only a weak dependence on orientation preference compared with those of layers 2/3 (Buzás et al., J Comp Neurol 499:861–881, 2006) and 4 (Karube and Kisvárday, Cereb Cortex 21:1443–1458, 2011).

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Title: Axon topography of layer 6 spiny cells to orientation map in the primary visual cortex of the cat (area 18)
Authors: Fuyuki Karube
Katalin Sári
Zoltán F. Kisvárday
Publication date: 01-04-2017
Publisher: Springer Berlin Heidelberg
Published in: Brain Structure and Function / Issue 3/2017
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-016-1284-z

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Axon topography of layer 6 spiny cells to orientation map in the primary visual cortex of the cat (area 18)

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