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3 March 2023 Ascending Visual Pathways to the Telencephalon in Teleosts with Special Focus on Forebrain Visual Centers, Associated Neural Circuitries, and Evolution
Hanako Hagio, Naoyuki Yamamoto
Author Affiliations +
Abstract

Visual pathways to the telencephalon in teleost fishes have been studied in detail only in a few species, and their evolutionary history remained unclear. On the basis of our recent studies we propose that there were two visual pathways in the common ancestor of teleosts, while one of them became lost in acanthopterygian fishes that emerged relatively recently. Our in-depth analyses on the connections of visual centers also revealed that there are connections shared with those of mammals, and retinotopic organization of the ascending connections is maintained at least to the level of the diencephalon in the yellowfin goby. The major visual telencephalic center, or the lateral part of the dorsal telencephalon (Dl), shows considerable species differences in the number of regions and cytoarchitecture. In particular, four highly specialized compartments are noted in the Dl of gobies, and we analyzed about 100 species of teleosts to investigate the evolution of the compartments in the Dl, which indicated that four compartments emerged only in Gobiiformes, while there are fewer specialized compartments in some other percomorph lineages. We also discuss the connections of forebrain visual centers with the cerebellum and other lower brain centers and infer possible functions of the circuitries.

© 2023 Zoological Society of Japan
Hanako Hagio and Naoyuki Yamamoto "Ascending Visual Pathways to the Telencephalon in Teleosts with Special Focus on Forebrain Visual Centers, Associated Neural Circuitries, and Evolution," Zoological Science 40(2), 105-118, (3 March 2023). https://doi.org/10.2108/zs220089
Received: 12 October 2022; Accepted: 10 December 2022; Published: 3 March 2023
KEYWORDS
actinopterygian
central visual system
cerebellum
evolution
Neural pathway
nucleus paracommissuralis
nucleus prethalamicus
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