. Comparative anatomy. Anatomy, Comparative. 64 COMPARATIVE ANATOMY produced within this growth zone or "germ ring" are added, some to the outer layer and some to the inner layer. This growth process, then, is concerned both in the narrowing of the blastopore and the elongating of the embryo. A direct consequence of it is that the material of a certain region of the inner layer immediately adjoining the blastopore attained its internal position not as a result of the primary invagination but by the secondary growth process. ANIMAL POLE I. Please note that these images are extracted f
. Comparative anatomy. Anatomy, Comparative. 64 COMPARATIVE ANATOMY produced within this growth zone or "germ ring" are added, some to the outer layer and some to the inner layer. This growth process, then, is concerned both in the narrowing of the blastopore and the elongating of the embryo. A direct consequence of it is that the material of a certain region of the inner layer immediately adjoining the blastopore attained its internal position not as a result of the primary invagination but by the secondary growth process. ANIMAL POLE I. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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