脑泡 brain vesicle
互联网
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指脊椎动物发生初期，在神经管前端脑形成区沿头尾方向排列的几个膨大部分而言。各脑泡之间以浅的凹缢为界，显示出脑的初期分化。通常是先出现原脑泡或初级脑泡，由前向后顺序地区分为前脑、中脑、后脑（或菱脑）的 3个脑泡。但是根据具体情况，以生于脑底的脑底褶为界，在其前方者为原脑，在其后方者为后脑。后来，前脑更分为端脑和间脑，而中脑原封不动，后脑也分成后脑（狭义的）和延髓，结果分为前后五个脑泡，各自继续分化构成脑的各部。
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