头突 head process
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脊椎动物羊膜类，尤其是鸟类和哺乳类的发生初期，在原条前方正中出现的前后细长、不透明的区域称为头突。这是已经陷入的脊索原基，显著伸长之后形成将来躯体的中轴。头突的后端与原条前端相接续，原条前端的这个部位变得粗大称为亨逊氏节。头突在外胚层的下面，接头突的外胚层后来肥厚形成神经板。
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