The Independent Evolution of Dorsal Pallia in Multiple Vertebrate Lineages.
| Autor: | Striedter GF; Department of Neurobiology and Behavior, University of California Irvine, Irvine, California, USA., Northcutt RG; Scripps Institution of Oceanography and Department of Neurosciences, School of Medicine, University of California San Diego, La Jolla, California, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Brain, behavior and evolution [Brain Behav Evol] 2022; Vol. 96 (4-6), pp. 200-211. Date of Electronic Publication: 2021 Jun 25. |
| DOI: | 10.1159/000516563 |
| Abstrakt: | Comparative neurobiologists have long wondered when and how the dorsal pallium (e.g., mammalian neocortex) evolved. For the last 50 years, the most widely accepted answer has been that this structure was already present in the earliest vertebrates and, therefore, homologous between the major vertebrate lineages. One challenge for this hypothesis is that the olfactory bulbs project throughout most of the pallium in the most basal vertebrate lineages (notably lampreys, hagfishes, and lungfishes) but do not project to the putative dorsal pallia in teleosts, cartilaginous fishes, and amniotes (i.e., reptiles, birds, and mammals). To make sense of these data, one may hypothesize that a dorsal pallium existed in the earliest vertebrates and received extensive olfactory input, which was subsequently lost in several lineages. However, the dorsal pallium is notoriously difficult to delineate in many vertebrates, and its homology between the various lineages is often based on little more than its topology. Therefore, we suspect that dorsal pallia evolved independently in teleosts, cartilaginous fishes, and amniotes. We further hypothesize that the emergence of these dorsal pallia was accompanied by the phylogenetic restriction of olfactory projections to the pallium and the expansion of inputs from other sensory modalities. We do not deny that the earliest vertebrates may have possessed nonolfactory sensory inputs to some parts of the pallium, but such projections alone do not define a dorsal pallium. (© 2021 The Author(s) Published by S. Karger AG, Basel.) |
| Databáze: | MEDLINE |
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