. Carnegie Institution of Washington publication. GASTRULATION. 71 earlier stage (fig. 65), we notice that (a) almost the entire fiattened rim of the blastoderm has been added; that (/>) in the posterior portion of this rim the ectoderm is already differentiating the medullar}' plate of the embryo, w; that (c) the major growth has taken place backwardâin witness of this, contrast the distance between the anterior end of the archenteron and the posterior rim of the blastopore in these two stages; that (1/) in this connection the main cell-mass extends itself dorsalwai'd and becomes the plate
. Carnegie Institution of Washington publication. GASTRULATION. 71 earlier stage (fig. 65), we notice that (a) almost the entire fiattened rim of the blastoderm has been added; that (/>) in the posterior portion of this rim the ectoderm is already differentiating the medullar}' plate of the embryo, w; that (c) the major growth has taken place backwardâin witness of this, contrast the distance between the anterior end of the archenteron and the posterior rim of the blastopore in these two stages; that (1/) in this connection the main cell-mass extends itself dorsalwai'd and becomes the plateau-like region of the blastoderm; that (r) the germinal wall rising abruptly beside the archenteron in the earlier stage becomes excavated in. sc '$>:"â â *. / * Fig. 66.âSagittal section of gastrula in which the embryo is appearing. f, Archenteron. *, Region of oulermosl margin of ventral lip of blastopore. pviy Posterior mass of cells (in position of ventral lip of blastopore). ''?', Region of blastopore. '", Thickening in medullary plate of emhry â s'", Segmentation 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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