Olfactory bulb projections in the bichir,Polypterus
| Autor: | Mark R. Braford, R. Glenn Northcutt |
|---|---|
| Rok vydání: | 1974 |
| Předmět: |
Central Nervous System
Telencephalon Dorsum Brain Mapping biology General Neuroscience Fishes Olfactory Pathways Anatomy biology.organism_classification Biological Evolution Olfactory Bulb Olfactory bulb Models Structural Cytoarchitecture Nerve Degeneration Neural Pathways Animals Bichir Neuroscience Polypterus |
| Zdroj: | The Journal of Comparative Neurology. 156:165-178 |
| ISSN: | 1096-9861 0021-9967 |
| Popis: | The central projections of the olfactory bulb were studied in Polypterus using the Nauta and Fink-Heimer techniques. Two major target areas were identified in the subpallium: the lateral subpallial nucleus and the dorsal and ventral entopeduncular nuclei. The connections are predominantly, if not exclusively, ipsilateral. In the pallium a massive ipsilateral projection to the superficial third of the medial pallium was demonstrated while the remainder of the pallium was found to be free of degeneration. Thus it appears that the pallium of Polypterus is not uniform throughout, as has been suggested in the literature. This contention is also supported by an analysis of the pallial cytoarchitecture. Because the pallium of Polypterus is everted, rather than inverted and evaginated, the topographically medial pallium is in topological correspondence with the lateral pallium of tetrapods. On the basis of this topological correspondence and the similarity of afference from the olfactory bulb, it is argued that the “medial” pallium of Polypterus is homologous to the pyriform pallium of tetrapods. The findings of this study are compared to those of similar studies in teleosts, which also have an everted pallium. An apparent conflict appears and suggestions for resolving it are offered. |
| Databáze: | OpenAIRE |
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