. Embryology. Embryology; Embryology; genealogy. BLASTODERM BLASTOCOEL MARGINAL PERIBLAST. Fig. 119. The early blastoderm of the hen's egg. Top: A section through the blastoderm, showing many cells which form the roof of a small cavity, the blastocoel. The floor of the blastocoel is non-cellular yolk. The wide circle repre- sents the yolk within the vitelline membrane. During development the blastoderm spreads over the surface of the yolk in the direction of the arrows. Center: A surface view of the blastoderm. Bounding the cellular portion of the blastoderm is a ring of protoplasm. This is th
. Embryology. Embryology; Embryology; genealogy. BLASTODERM BLASTOCOEL MARGINAL PERIBLAST. Fig. 119. The early blastoderm of the hen's egg. Top: A section through the blastoderm, showing many cells which form the roof of a small cavity, the blastocoel. The floor of the blastocoel is non-cellular yolk. The wide circle repre- sents the yolk within the vitelline membrane. During development the blastoderm spreads over the surface of the yolk in the direction of the arrows. Center: A surface view of the blastoderm. Bounding the cellular portion of the blastoderm is a ring of protoplasm. This is the periblast, a ring of non-cellular protoplasm containing nuclei. As this protoplasm is incorporated into cells the area of the blastoderm increases. 205. 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 Barth, Lester G. (Lester George), 1905-1979. New York, Dryden Press
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