. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. FOREGUT-f- I ANTERIOR NTESTINAL 5 PORTAL MIDGUT- NOTOCHORD- NEURAL- 5 ECTODERM !| â 'F II POSTERIOR it INTESTINAL PORTAL A â^. ^ '.V ANTERIOR NEUROPORE CAUDAL FOLD OF AMNION ANTERIOR NEUROPORE. Fig. 242. Early development of the pig embryo (B, C, and G from Patten: Embryology of the Pig, Philadelphia, Blakiston; A is from Streeter: Carnegie Inst. Publ. No. 380, Contrib.'to Embryol. 100; D, E, and F from Heuser and Streeter: Carnegie Inst. Publ. No
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. FOREGUT-f- I ANTERIOR NTESTINAL 5 PORTAL MIDGUT- NOTOCHORD- NEURAL- 5 ECTODERM !| â 'F II POSTERIOR it INTESTINAL PORTAL A â^. ^ '.V ANTERIOR NEUROPORE CAUDAL FOLD OF AMNION ANTERIOR NEUROPORE. Fig. 242. Early development of the pig embryo (B, C, and G from Patten: Embryology of the Pig, Philadelphia, Blakiston; A is from Streeter: Carnegie Inst. Publ. No. 380, Contrib.'to Embryol. 100; D, E, and F from Heuser and Streeter: Carnegie Inst. Publ. No. 394, Contrib. to Embryol. 109. All figures have been modified). (A) Early, neural groove stage. Neural area is shown in black; amnion is cut away as indicated. (B) Four-somite stage. (C) Median sagittal section, approximating the stage of develop- ment shown in (B). Observe foregut, midgut, and hindgut areas. (D) Embryo of about six pairs of somites. (E) Embryo of about 7 to 8 pairs of somites. (F) Eighteen pairs of somites. (G) Sagittal sectional diagram of embryo slightly younger than (F), showing neural and gut tubes, amnion, allantois, and forming heart. 496. 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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