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Projections of the nucleus of the basal optic root in pigeons (Columba livia): A comparison of the morphology and distribution of neurons with different efferent projections

Published online by Cambridge University Press:  04 October 2007

DOUGLAS R.W. WYLIE ,
JANELLE M.P. PAKAN ,
CAMERON A. ELLIOTT ,
DAVID J. GRAHAM  and
ANDREW N. IWANIUK
DOUGLAS R.W. WYLIE
Affiliation:
Department of Psychology, University of Alberta, Edmonton, Alberta, Canada University Centre for Neuroscience, University of Alberta, Edmonton, Alberta, Canada
JANELLE M.P. PAKAN
Affiliation:
University Centre for Neuroscience, University of Alberta, Edmonton, Alberta, Canada
CAMERON A. ELLIOTT
Affiliation:
University Centre for Neuroscience, University of Alberta, Edmonton, Alberta, Canada
DAVID J. GRAHAM
Affiliation:
University Centre for Neuroscience, University of Alberta, Edmonton, Alberta, Canada
ANDREW N. IWANIUK
Affiliation:
Department of Psychology, University of Alberta, Edmonton, Alberta, Canada
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Abstract

The avian nucleus of the basal optic root (nBOR) is a visual structure involved in the optokinetic response. nBOR consists of several morphologically distinct cell types, and in the present study, we sought to determine if these different cell types had differential projections. Using retrograde tracers, we examined the morphology and distribution of nBOR neurons projecting to the vestibulocerebellum (VbC), inferior olive (IO), dorsal thalamus, the pretectal nucleus lentiformis mesencephali (LM), the contralateral nBOR, the oculomotor complex (OMC) and a group of structures along the midline of the mesencephalon. The retrogradely labeled neurons fell into two broad categories: large neurons, most of which were multipolar rather than fusiform and small neurons, which were either fusiform or multipolar. From injections into the IO, LM, contralateral nBOR, and structures along the midline-mesencephalon small nBOR neurons were labeled. Although there were no differences with respect to the size of the labeled neurons from these injections, there were some differences with the respect to the distribution of labeled neurons and the proportion of multipolar vs. fusiform neurons. From injections into the VbC, the large multipolar cells were labeled throughout nBOR. The only other cases in which these large neurons were labeled were contralateral OMC injections. To investigate if single neurons project to multiple targets we used paired injections of red and green fluorescent retrograde tracers into different targets. Double-labeled neurons were never observed indicating that nBOR neurons do not project to multiple targets. We conclude that individual nBOR neurons have unique projections, which may have differential roles in processing optic flow and controlling the optokinetic response.

Keywords

OptokineticOculomotorAccessory optic systemPretectumVestibulocerebellumInferior olive
Type
Research Article
Information
Visual Neuroscience , Volume 24 , Issue 5 , September 2007 , pp. 691 - 707
Copyright
© 2007 Cambridge University Press

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