. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. C D Fig. 38.—An animal egg. A, unfertilized egg. B, four-cell stage. C, blastula stage. D, gastrula stage. (blastula) the cavity of which is the segmentation cavity, or blastocoele (Fig. 38C). One side of the hollow blastula then becomes pushed inward, or invaginated, as if one side of a hollow rubber ball were dimpled, resulting in a cup-hke structure (Fig. 3SD). The process of invagination is termed "
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. C D Fig. 38.—An animal egg. A, unfertilized egg. B, four-cell stage. C, blastula stage. D, gastrula stage. (blastula) the cavity of which is the segmentation cavity, or blastocoele (Fig. 38C). One side of the hollow blastula then becomes pushed inward, or invaginated, as if one side of a hollow rubber ball were dimpled, resulting in a cup-hke structure (Fig. 3SD). The process of invagination is termed "gastrulation"; the cup with its double wall, the "; The cavity of the gastrula is the primitive digestive cavity (archenteron); the opening is the blastopore. Of the two layers resulting from the invagination of the blastula, the outer one forms the ectoderm, or epi- 65. 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 Johannsen, O. A. (Oskar Augustus), 1870-1961; Butt, Ferdinand Hinckley, 1899-. New York, London, McGraw-Hill Book Company, inc.
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