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Telencephalic projections to the nucleus of the basal optic root and pretectal nucleus lentiformis mesencephali in pigeons

Published online by Cambridge University Press:  02 June 2005

DOUGLAS R.W. WYLIE ,
CATHERINE J. OGILVIE ,
NATHAN A. CROWDER ,
RYAN R. BARKLEY  and
IAN R. WINSHIP
DOUGLAS R.W. WYLIE
Affiliation:
Department of Psychology, University of Alberta, Edmonton, Alberta, Canada University Centre for Neuroscience, University of Alberta, Edmonton, Alberta, Canada
CATHERINE J. OGILVIE
Affiliation:
Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
NATHAN A. CROWDER
Affiliation:
University Centre for Neuroscience, University of Alberta, Edmonton, Alberta, Canada Present address: Research School of Biological Sciences, The Australian National University, GPO Box 475, Canberra, Australia ACT 2601
RYAN R. BARKLEY
Affiliation:
Department of Psychology, University of Alberta, Edmonton, Alberta, Canada
IAN R. WINSHIP
Affiliation:
Department of Psychology, University of Alberta, Edmonton, Alberta, Canada
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Abstract

In birds, the nucleus of the basal optic root (nBOR) of the accessory optic system (AOS) and the pretectal nucleus lentiformis mesencephali (LM) are involved in the analysis of optic flow and the generation of the optokinetic response. In several species, it has been shown that the AOS and pretectum receive input from visual areas of the telencephalon. Previous studies in pigeons using anterograde tracers have shown that both nBOR and LM receive input from the visual Wulst, the putative homolog of mammalian primary visual cortex. In the present study, we used retrograde and anterograde tracing techniques to further characterize these projections in pigeons. After injections of the retrograde tracer cholera toxin subunit B (CTB) into either LM or nBOR, retrograde labeling in the telencephalon was restricted to the hyperpallium apicale (HA) of the Wulst. From the LM injections, retrograde labeling appeared as a discrete band of cells restricted to the lateral edge of HA. From the nBOR injections, the retrograde labeling was more distributed in HA, generally dorsal and dorso-medial to the LM-projecting neurons. In the anterograde experiments, biotinylated dextran amine (BDA) was injected into HA and individual axons were reconstructed to terminal fields in the LM and nBOR. Those fibers projecting to the nBOR also innervated the adjacent ventral tegmental area. However, tracing of BDA-labeled axons revealed no evidence that individual neurons project to both LM and nBOR. In summary, our results suggest that the nBOR and LM receive input from different areas of the Wulst. We discuss how these projections may transmit visual and/or somatosensory information to the nBOR and LM.

Keywords

OptokineticOptic flowAccessory optic systemPretectumVisual Wulst
Type
Research Article
Information
Visual Neuroscience , Volume 22 , Issue 2 , March 2005 , pp. 237 - 247
Copyright
© 2005 Cambridge University Press

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