. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. TYPES OF CHORDATE BLASTULAE 365. ARCHENTERIC SPACE TRO PHOBL AST ARCHENTERIC SPA CE Fig. 178. Schematic drawings of the developing blastocyst of the monkey. (After Heuser and Streeter: Carnegie Inst., Washington. Publ. 538. Contrib. to Embryol. No. 181.) (A, B) Early blastocysts showing formative and non-formative cells in the inner cell mass. (C-E) Later arrangement of the formative cells into an upper epiblast and lower hypoblast layer. These ce
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. TYPES OF CHORDATE BLASTULAE 365. ARCHENTERIC SPACE TRO PHOBL AST ARCHENTERIC SPA CE Fig. 178. Schematic drawings of the developing blastocyst of the monkey. (After Heuser and Streeter: Carnegie Inst., Washington. Publ. 538. Contrib. to Embryol. No. 181.) (A, B) Early blastocysts showing formative and non-formative cells in the inner cell mass. (C-E) Later arrangement of the formative cells into an upper epiblast and lower hypoblast layer. These cells form the mother entoderm cells, and by mitotic activity they give origin to an entodermal layer which adheres to the underside of the thickened polar area (fig. 176B, C). The polar area then thins out to form the expansive condition shown in figure 176D. A bilaminar, disc-shaped area thus is formed in this immediate region of the blastocyst, and it represents the area occupied. 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 Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston
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