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Reference number: 571
A global perspective on the functional organization of the avian telencephalon | | ED Jarvis | | Duke University Medical Center, Durham, NC 27710 USA | Based on the brain expression pattern of 40 constitutive and behaviorally-regulated genes in songbirds and a subset of these in other avian orders, we present a novel view of the functional organization of the avian cerebrum. The behaviorally-regulated gene expression patterns reveal that the avian cerebrum has functional columnar organization analogous to that found in mammalian cortex and associated striatum. These columns are of two types: those formed by the striatum, nidopallium, ventral mesopallium, and primary sensory neurons intercalated between the nidopallium and striatum; and those formed by the hyperpallium, dorsal mesopallium, and primary sensory neurons intercalated between the hyperpallium and dorsal mesopallium. The nidopallium and hyperpallium are molecularly similar brain subdivisions that surround two halfs of the mesopallium. The two halves of the mesopallium appear to form during development first as a single sheet of cells that then expand and fold onto each other as the lateral ventricle closes up, with the hyperpallium and nidopallium folding with them. When viewed globally, the results suggest that the avian pallium has four major cell groupings, a primary sensory neuron group (intercalated nidopallium and intercalated hyperpallium), a secondary group (nidopallium and hyperpallium), a tertiary group (ventral and dorsal mesopallium), and an output group (the arcopallium). Each group contributes portions to columns that control different sensory or motor behaviors.
| | Keywords: molecular biology, birds, evolution |
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| | This talk is part of symposium/workshop number 54: Avian neuroanatomy |
| | Direct link to this abstract: http://www.behav.org/IEC/default.php?proc=search&search=a_num&id=571 |
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