Brain, Behavior and Evolution

Original Paper

Efferents and Centrifugal Afferents of the Main and Accessory Olfactory Bulbs in the Snake Thamnophis sirtalis

Lanuza E. · Halpern M.

Author affiliations

Department of Anatomy and Cell Biology, Health Science Center at Brooklyn, Brooklyn, N.Y., USA

Keywords: Main olfactory bulbAccessory olfactory bulbOlfactory projectionsVomeronasal projectionsCentrifugal projectionsSnakesReptilesEvolution

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Brain Behav Evol 1998;51:1–22
https://doi.org/10.1159/000006525

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: December 05, 1997
Issue release date: January 1998

Number of Print Pages: 22
Number of Figures: 7
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: https://www.karger.com/BBE

Abstract

This study reinvestigates the efferent projections of the main and accessory olfactory bulbs and describes for the first time the centrifugal projections to the main and accessory olfactory bulbs in the snake Thamnophis sirtalis, using the intraaxonal transport of the anterograde and retrograde tracer biotinylated dextran amine and the retrograde tracer horseradish peroxidase. The olfactory projection consists of three tracts: the lateral olfactory tract, which projects bilaterally to the lateral cortex and the rostral amygdala, crossing the midline through the stria medullaris-habenular commissure system; the intermediate olfactory tract, which projects ipsilaterally to the olfactory tubercle and contributes to the contralateral projection; and the medial olfactory tract, which projects ipsilaterally to the dorsomedial retrobulbar formation. The vomeronasal projection is formed by a single tract, the accessory olfactory tract, that projects ipsilaterally to the nucleus of the accessory olfactory tract, the medial amygdala and the nucleus sphericus. The centrifugal projections to the main and accessory olfactory bulb are composed of two components: one that arises in areas that receive the olfactory or vomeronasal input (neurons in the olfactory tubercle, retrobulbar formation and lateral cortex project to the main olfactory bulb; and neurons in the nucleus of the accessory olfactory tract, the medial amygdala and the nucleus sphericus project to the accessory olfactory bulb), and another that arises in areas not directly implicated in processing the chemosensory information (the nucleus of the diagonal band of Broca and the dorsal cortex). These data allow the recognition of the general pattern of organization of the reptilian olfactory and vomeronasal systems.



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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: December 05, 1997
Issue release date: January 1998

Number of Print Pages: 22
Number of Figures: 7
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: https://www.karger.com/BBE

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1998, Vol.51, No. 1

January 1998

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