. The anatomical record. Anatomy; Anatomy. MECHANISM OF EMBRYONIC FOLDINGS 419 Roux and Rhumbler were the first to point to the different sizes of the blastomeres as being influential in gastrulation. Rhumbler, however, believes that chemotaxis alone is the in- ducing factor of gastrulation, while mechanical forces serve merely to assist the process after it has once begun. Yet there are some reasons, at least, to think that mechanical agents alone might force the entodermal cells towards the Figure 3 Figure 3, in which the direction of pressure is indicated by the arrows, will sh
. The anatomical record. Anatomy; Anatomy. MECHANISM OF EMBRYONIC FOLDINGS 419 Roux and Rhumbler were the first to point to the different sizes of the blastomeres as being influential in gastrulation. Rhumbler, however, believes that chemotaxis alone is the in- ducing factor of gastrulation, while mechanical forces serve merely to assist the process after it has once begun. Yet there are some reasons, at least, to think that mechanical agents alone might force the entodermal cells towards the Figure 3 Figure 3, in which the direction of pressure is indicated by the arrows, will show, how mechanical forces might play a very im- portant part in invagination. The compression from the side of the ectoderm will be the greater, the nearer to the periphery the compressed region lies. On the other hand, the tendency to expand will be greatest near the basal poles, since in this region lie more of the formed parts of the cells (yolk granules, etc.).. 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 Bardeen, Charles Russell, 1871-1935, ed; Boyden, Edward A. (Edward Allen), 1886-1976; Bremer, John Lewis, 1874- ed; Hardesty, Irving, b. 1866, ed; American Association of Anatomists; American Society of Zoologists; Wistar Institute of Anatomy and Biology. [New York, etc. ] A. R. Liss [etc. ]
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