Archive image from page 128 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 HEAD-FOLD TO TWELVE SOMITES 109 .2. â pr str. Fig. 63. âEmbryo of 12 s, from above, drawn as a transparent object with transmitted light. X 30. Abbreviations as before. IV. The Mesoblast The changes in the mesoblast during this period are of great importance. At the time of appearance of the head-fold it con- sists of two great sheets of cells between ectoderm and entoderm

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