. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. itvV ''>c,"i^- ,-'?.â ⢠-Vt-. EPIDERMAL'fOLD^IflV SBE GINNING OF HE 40 FOLD 'ââ ,;,* *;â " PROAMNION / "â 'â .. â¢".V nSB \ PR MITIVE STREAK I si >. 1 s jfe: \i .'^ w ^' II " '^â l, ^^k. J. vy ; eS^ S^::^iN^t^ Vv- â¢"as 1. Fig. 232. Early post-gastrular development in the chick. (A-H represent a late head-process stageâstage 5 of Hamburger and Hamilton, '51. Compare with figure 203D. I-L show the beginnings of
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. itvV ''>c,"i^- ,-'?.â ⢠-Vt-. EPIDERMAL'fOLD^IflV SBE GINNING OF HE 40 FOLD 'ââ ,;,* *;â " PROAMNION / "â 'â .. â¢".V nSB \ PR MITIVE STREAK I si >. 1 s jfe: \i .'^ w ^' II " '^â l, ^^k. J. vy ; eS^ S^::^iN^t^ Vv- â¢"as 1. Fig. 232. Early post-gastrular development in the chick. (A-H represent a late head-process stageâstage 5 of Hamburger and Hamilton, '51. Compare with figure 203D. I-L show the beginnings of the head foldâintermediate condition between stages 7 and 8 of Hamburger and Hamilton, '51.) (A) Surface view, showing primitive streak, neural plate, and epidermal areas. (B-F) Cross sections of A at levels indicated on G. (G) Median sagittal section of (A). (H) Same, showing presumptive, organ- forming areas of entoderm notochord, pre-chordal plate, neural plate, and primitive-streak mesoderm. (I) Surface view, demonstrating a marked antero-posterior extension of the neural plate area and beginnings of neural folds. Observe shortening of primitive streak. (J) Drawing of stained specimen. (K) Median sagittal section of (J). (L) Same, showing major organ-forming areas. In (G) and (H) the entoderm, notochord, and overlying neural ectoderm are drawn as separate layers. Actually, however, at this stage, the three layers are intimately associated. 480. 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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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
