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Dissection of Hippocampal Dentate Gyrus from Adult Mouse
Published on: November 18, 2009
哺乳類における脳構造のモザイク進化
1Department of Anthropology, University of Durham, UK. r.a.barton@durham.ac.uk
Nature
|July 13, 2000
まとめ
哺乳類の脳の進化は,単なる協調的な成長ではなく,モザイクの変化を示しています. 新皮質のような特定の脳領域は独立して拡張し,発達可塑性の限界に関する理論に異議を唱えた.
科学分野:
- 神経科学は神経科学である.
- 進化生物学の進化生物学について
- 比較解剖学 比較解剖学とは
背景:
- 哺乳類の脳には,機能的に異なるシステムがあります.
- 以前の研究では,発達上の制約が脳のモザイク進化を制限し,調整されたサイズ変化を引き起こすことを示唆していました.
- この研究は,哺乳類の脳構造におけるモザイク進化の範囲を調査しています.
研究 の 目的:
- 哺乳類の脳構造進化に関する比較データを分析する.
- モザイクの変化が脳進化の重要な要因であったことを示すために.
- 発達上の制約が脳の進化を独占的に支配するという考えに異議を唱える.
主な方法:
- 異なる哺乳類群における脳構造の容量の比較分析.
- アロメトリックスケーリングの関係を説明するための統計分析.
- 基本的な脳のサブディビジョンと微細な機能システムのレベルでの進化的変化の検討.
主要な成果:
- 新皮質の体積は,脳全体の大きさとは無関係に,霊長類と昆虫食者の間の有意な違いを示しています.
- 強力な解剖学的および機能的なつながりを持つ脳の構造は,統合的に進化したが,他の脳の構成要素と常に協調しているわけではない.
- モザイク進化は,脳組織のさまざまなレベルにおいて,広範なサブディビジョンから特定の機能的システムまで観察されました.
結論:
- 脳の構成要素の選択的なサイズ変化によって特徴づけられるモザイク進化は,哺乳類の脳進化の主要な原動力である.
- 発達上の制約は,脳のシステムの独立した進化を完全に防ぐことはできません.
- 脳の進化は,構成部分の調整された,独立した変化の複雑な相互作用を伴う.
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