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Projections of the olfactory bulb in an elasmobranch fish, Sphyrna tiburo: segregation of inputs in the telencephalon

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Abstract

We have previously shown that the morphological compartmentalization of the elasmobranch olfactory bulb is accompanied by a topographical arrangement of the primary olfactory projections onto the bulb. If this spatial arrangement is significant for the processing of the information, one would expect it to be preserved in the secondary olfactory centers of the telencephalon. In this paper, we describe the elasmobranch secondary projections from the olfactory bulb to the telencephalon, focusing on their spatial arrangements within the forebrain. Results show that the olfactory input onto the telencephalon are segregated. The medial olfactory tract projects rostrally onto the superficial layer of the dorsal pallium and onto the lateral pallium. The lateral olfactory tract projects caudally onto the lateral pallium, the striatum and the area superficialis basalis. Thus, the secondary olfactory projections are segregated within the telencephalon, with an overlapping of the secondary fibers in the main projection area, the lateral pallium.

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  1. Program in Neuroscience, Department of Biological Science, Florida State University, 32306, Tallahassee, FL, USA

    Laurence Dryer & Pasquale P. C. Graziadei

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  1. Laurence Dryer
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  2. Pasquale P. C. Graziadei
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Dryer, L., Graziadei, P.P.C. Projections of the olfactory bulb in an elasmobranch fish, Sphyrna tiburo: segregation of inputs in the telencephalon. Anat Embryol 190, 563–572 (1994). https://doi.org/10.1007/BF00190106

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