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Brain, behavior and evolution, 2021-07, Vol.95 (6), p.302-316
2021

Details

Autor(en) / Beteiligte
Titel
Evolution of the Hypothalamus and Inferior Lobe in Ray-Finned Fishes
Ist Teil von
  • Brain, behavior and evolution, 2021-07, Vol.95 (6), p.302-316
Ort / Verlag
Basel, Switzerland
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
  • The inferior lobes are prominent bilateral brain areas in the hypothalamus of neopterygians among the ray-finned fishes. They are known as multisensory integration centers. As such, they should play a major role in fish evolution. In this study, a comparative morphometric analysis was performed. The morphology of the hypothalamus, where the inferior lobe is considered as fully developed first in Lepisosteus, was then re-examined. One hundred brains from different species of 60 families of ray-finned fishes were stained with cresyl violet and embedded in methacrylate. They were then cut on a microtome while conducting block-face imaging. The volumes were determined for the whole brain, brain areas, and nuclei. Since visual input represents a major sensory input for the inferior lobe, the nucleus glomerulosus, a visual-related nucleus in paracanthopterygian and acanthopterygian teleosts, and the tectum opticum were included in the investigations. The morphometric analysis revealed that the relative volume of the inferior lobes increases significantly from species of the Lepisosteiformes to the Tetraodontiformes. In addition, a positive correlation was detected between the relative volume of the inferior lobes and either the relative volume of the nucleus glomerulosus or the relative volume of the tectum opticum. These correlations, in combination with findings from previous hodological and behavioral studies, give rise to the speculation that the inferior lobes may be involved in higher cognitive processes and complex social interactions.
Sprache
Englisch
Identifikatoren
ISSN: 0006-8977
eISSN: 1421-9743
DOI: 10.1159/000505898
Titel-ID: cdi_proquest_miscellaneous_2382657766
Format
Schlagworte
Original Paper

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