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Molecular Profiling Reveals Insight into Avian Brain Organization and Functional Columnar Commonalities with Mammals

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Brain Evolution by Design

Abstract

The avian cerebrum has pallial functions similar to those of the mammalian cortex. Although the avian pallium is organized as nuclear structures, and the mammalian cortex as layers, the avian pallium supports cognitive abilities similar to those of many mammals. We recently presented a global view of the pallial organization of birds, based on quantitative analyses of constitutively expressed or behaviorally regulated genes in different pallial cell populations (Jarvis et al. J Comp Neurol 521:3614–3665, 2013; Chen et al. J Comp Neurol 521:3666–3701, 2013). Here we present a shortened synopsis of these articles. The findings of the constitutively expressed genes and known neural connectivity reveal four major cell populations: (1) a primary sensory input population, (2) a secondary intrapallial population, (3) a tertiary intrapallial population, and (4) a quaternary output population. These populations have greater similarities to cell layers of the mammalian cortex than to the amygdala. The patterns of behaviorally regulated genes revealed functional columns of activation across boundaries of these cell populations, reminiscent of columns through layers of the mammalian cortex. Each neural cell population contributes portions to columns that control different sensory or motor systems. These findings influence hypotheses on homologies of the avian pallium with other vertebrates.

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Correspondence to Kazuhiro Wada .

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Wada, K., Chen, CC., Jarvis, E.D. (2017). Molecular Profiling Reveals Insight into Avian Brain Organization and Functional Columnar Commonalities with Mammals. In: Shigeno, S., Murakami, Y., Nomura, T. (eds) Brain Evolution by Design. Diversity and Commonality in Animals. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56469-0_11

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