Archive image from page 156 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 FROM TWELVE TO THIRTY-SIX SOMITES 137 (a diagrammatic outline is first given and a detailed description follows). The somatopleure becomes elevated in the form of a fold surrounding the embryo; this fold begins first in front of the head of the embryo as the head-fold of the amnion, which 0/3. yes. Mesenc auJ Vojn Fig. 74. — Head of the same embryo from the ventral side. Abbreviations as before.

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