What question did this study set out to answer?

Map the efferent projection targets and topographic organization of the olfactory bulb in the American opossum.

September 1, 1981The Anatomical Record

Central connections of the olfactory bulb in the american opossum (didelphys virginiana): A light microscopic degeneration study

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Authors

RMRainer-Peter MeyerSpringer Nature (Germany)

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Implication

Histological tracing reveals conserved olfactory bulb projection pathways in American opossums, suggesting primitive mammals share forebrain smell-processing architecture with placental mammals.

Key Points

Map the efferent projection targets and topographic organization of the olfactory bulb in the American opossum.
Unilateral destructive lesions were induced in the right olfactory bulb of 16 adult opossums (Didelphys virginiana).
Brain tissue was harvested after 4 to 31 days of survival and prepared in coronal, horizontal, or sagittal planes using Fink-Heimer II silver degeneration staining.
Efferent axons projected through the ipsilateral lateral olfactory tract (LOT) with preserved topography, mapping the dorsal, lateral, and ventral bulb respectively to dorsal, intermediate, and ventral LOT sectors.
Terminal degeneration appeared in the superficial molecular layer of the anterior olfactory nucleus, piriform cortex, olfactory tubercle, lateral entorhinal cortex, and cortical amygdaloid nucleus, but spared the anterior commissure.

Cite This Study

Rainer-Peter Meyer (1981) studied this question.

synapsesocial.com/papers/6a99c533e98079fa2f39ff7e https://doi.org/10.1002/ar.1092010116

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Implication

Histological tracing reveals conserved olfactory bulb projection pathways in American opossums, suggesting primitive mammals share forebrain smell-processing architecture with placental mammals.