. Embryology. Embryology; Embryology; genealogy. LATERAL LIP. Fig. 66. Changes in the shape of the presumptive notochord and the pre- sumptive neural plate during gastrulation. Top left: The presumptive notochord on the surface of the early gastrula. Arrows show direction of movement of cells. Center left: The presumptive notochord has migrated to and over the lip of the blastopore. The dotted line shows that portion of the notochord which has invaginated and formed a part of the roof of the archenteron. Arrows indi- cate direction of movement. Loiver left: Almost all of the presumptive notoch
. Embryology. Embryology; Embryology; genealogy. LATERAL LIP. Fig. 66. Changes in the shape of the presumptive notochord and the pre- sumptive neural plate during gastrulation. Top left: The presumptive notochord on the surface of the early gastrula. Arrows show direction of movement of cells. Center left: The presumptive notochord has migrated to and over the lip of the blastopore. The dotted line shows that portion of the notochord which has invaginated and formed a part of the roof of the archenteron. Arrows indi- cate direction of movement. Loiver left: Almost all of the presumptive notochord has turned under the lip of the blastopore. It is now in the shape of a long, narrow strip comprising a part of the roof of the archenteron. Top right: Ap- proximate shape of the presumptive neural plate of an early gastrula. Arrows show direction of cell migrations. Center right: The presumptive neural plate has become compressed laterally and stretched along its anteroposterior axis. Lower right: The final shape of the actual neural plate. 124. 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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