Archive image from page 115 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 96 THE DEVELOPMENT OF THE CHICK tive streak, but this part becomes distinct as the primitive streak spUts into its derivatives. It is therefore only when the latter is entirely used up that the entire length of the medullary plate is established. However, long before this time the greater por- tion has become converted by folding into the neural tube, a process that proceeds in general from in front backwards. Thus F6. giSifetfS'

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Archive image from page 115 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 96 THE DEVELOPMENT OF THE CHICK tive streak, but this part becomes distinct as the primitive streak spUts into its derivatives. It is therefore only when the latter is entirely used up that the entire length of the medullary plate is established. However, long before this time the greater por- tion has become converted by folding into the neural tube, a process that proceeds in general from in front backwards. Thus F6. giSifetfS' sz:

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