预定区 presumptive area，prospective region

互联网2013-11-14

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预定区 presumptive area， prospective region 在正常发生中，把将来可形成某器官或组织的胚区叫作该器官或组织的预定区。例如预定神经板，预定脊索等，是指在正常发生中，将来可分别形成神经板，脊索等的胚区。预定区一词大多用于原基形态可辨以前的发育阶段。某器官的预定区往往也具有形成该器官以外的其他器官的能力。

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