. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. Fig. 5. Diagram of a gastrula and of the later closure of the blastopore. a, archenteron; b, blastopore ; ec, ectoderm ; en, entoderm ; S, segmentation cavity. entoderm is the archenteron (stomach), and the opening where ectoderm and entoderm meet, and where the archenteron com- municates with the external world, is the blastopore. Usually. Fig. 6. Sagtital section of early embryo (late gastrula) of Amblystoma. b, blastopore; c, beginning of infolding of brain; t, entoderm; in, thickening of ectoderm for mouth, hypophysis, a
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. Fig. 5. Diagram of a gastrula and of the later closure of the blastopore. a, archenteron; b, blastopore ; ec, ectoderm ; en, entoderm ; S, segmentation cavity. entoderm is the archenteron (stomach), and the opening where ectoderm and entoderm meet, and where the archenteron com- municates with the external world, is the blastopore. Usually. Fig. 6. Sagtital section of early embryo (late gastrula) of Amblystoma. b, blastopore; c, beginning of infolding of brain; t, entoderm; in, thickening of ectoderm for mouth, hypophysis, and nose ; ms, mesoderm ; y, yolk-mass. the blastopore is an elongate slit, its major diameter coinciding with the longitudinal axis of the future anirnal. Soon after invagination, the blastopore begins to close, the opposite lips I In many English works these two layers are called respectively epiblast and hypoblast, while the mesoderm, to be mentioned later, is called mesoblast. There is no longer necessity for using these 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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