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• W2053053034 abstract "In adult zebra finches (Taeniopygia guttata), the telencephalon occupies 64% of the entire brain. This fraction is similar to what is seen in parrots, but many other birds possess a significantly smaller telencephalon. The aim of the present study was to determine the developmental time course and cellular basis of telencephalic enlargement in zebra finches, and then to compare these findings with what is known about telencephalic enlargement in other birds. To this end we estimated the volumes of all major brain regions from serial sections in embryonic and post-hatching zebra finches. We also labeled proliferating cells with antibodies against proliferating cell nuclear antigen and phosphorylated histone H3. An important finding to emerge from this work is that the telencephalon of zebra finches at hatching contains a thick proliferative subventricular zone (SVZ) that extends from the subpallium into the dorsal pallium. The data also show that the onset and offset of telencephalic neurogenesis are both delayed in zebra finches relative to quail (Galliformes). This delay in neurogenesis, in conjunction with the expanded SVZ, probably accounts for most of the telencephalic enlargement in passerines such as the zebra finch. In addition, passerines enlarged their telencephalon by decreasing the proportional size of their midbrain tectum. Because the presumptive tectum is proportionally smaller in zebra finches than quail before neurogenesis begins, this difference in tectum size cannot be due to evolutionary alterations in neurogenesis timing. Collectively these findings indicate that several different developmental mechanisms underlie the evolution of a large telencephalon in passerines. J. Comp. Neurol. 514:203–213, 2009. © 2009 Wiley-Liss, Inc." @default.
• W2053053034 created "2016-06-24" @default.
• W2053053034 creator A5010918813 @default.
• W2053053034 creator A5054785235 @default.
• W2053053034 date "2009-05-10" @default.
• W2053053034 modified "2023-10-18" @default.
• W2053053034 title "Developmental origins of mosaic brain evolution: Morphometric analysis of the developing zebra finch brain" @default.
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• W2053053034 doi "https://doi.org/10.1002/cne.22005" @default.
• W2053053034 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19266567" @default.
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