Archive image from page 116 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 HEAD-FOLD TO TWELVE SOMITES 97 the undifferentiated mass of the primitive streak. These condi- tions must be born in mind in the following description. The Neural Groove and Folds. Shortly after the formation of the head-fold the center of the medullary plate becomes sunk in the form of a deep groove beginning a short distance behind the f:-:>- â¢/2.' 'â m.

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