Excerpt from Journal of Comparative Neurology, 1921, Vol. 33 Up to the last stage described there is practically no indication that cells are added to the crest, as defined, from the lateral ectoderm. The crest is continuous on its dorsal border with the inner layer of the ectoderm, and undoubtedly receives cells from this source (figs. 1, 2, 3, and and in several series at the age of that from which figure 3 is taken and the crest 1s continuous ventrally with the inner layer (fig. This continuity is usually absent at the ...
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Excerpt from Journal of Comparative Neurology, 1921, Vol. 33 Up to the last stage described there is practically no indication that cells are added to the crest, as defined, from the lateral ectoderm. The crest is continuous on its dorsal border with the inner layer of the ectoderm, and undoubtedly receives cells from this source (figs. 1, 2, 3, and and in several series at the age of that from which figure 3 is taken and the crest 1s continuous ventrally with the inner layer (fig. This continuity is usually absent at the level under consideration as the lateral portions of the crest become better defined (figs. 5 and 6) and also in the earlier stages (fig. These conditions as described at the level of the VII ganglion are duplicated at the levels of ganglia V, IX, and X. In the intervals between these ganglia the neural-crest cells are less numerous and the lateral extensions contain fewer cells and do not reach so far ventrally. At the stage from which figure 5 was taken (fig. The neural crest is continuous throughout the whole region. In the stage from which figure 6 was taken (fig. 8) the crest is interrupted, except for a few scattered cells on the dorsal portion of the cord, between the V and VII ganglia and again between the VII and IX ganglia. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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