. The development of the chick; an introduction to embryology. Birds -- Embryology. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabil
. The development of the chick; an introduction to embryology. Birds -- Embryology. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947. New York, Holt
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