Fayl:Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus (1953) (20047812224).jpg

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Title: Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus
Identifier: comparativeembry00nels (find matches)
Year: 1953 (1950s)
Authors: Nelsen, Olin E. (Olin Everett), b. 1898
Subjects: Vertebrates -- Embryology; Comparative embryology
Publisher: New York, Blakiston
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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GASTRULATION IN VARIOUS CHORDATA 409 in a manner similar to the pre-chordal and notochordal cells; rather, upon reaching the edge of the blastopore, it involutes over the lip, then insinuates itself between the inside entoderm and the external surface layer of cells, and, in this position, passes inward and forward between the entoderm and the external layer of cells (figs. 19IH; 198A).
Text Appearing After Image:
YOLK PLUG Fig. 191. Migration of the presumptive organ-forming areas of the blastula during gastrulation in the amphibia (with reference particularly to the frog). (See fig. 192.) (A) Late blastula, sagittal section through midplane of future embryo. (B-F) Observe processes of epiboly and emboly. In epiboly, the black (neural) and white (epidermal) areas become extended and gradually envelop (fig. 192A) the inward moving notochord, entoderm, and mesoderm. The processes concerned with emboly bring about the inward migration of the latter presumptive areas. (G) Late gastrular condition, with neural area and upper portion of the epidermal area removed to show relationships of the middle germ layer of chordamesoderm. (H) Horizontal section of middle gastrular condition, showing involution of mesoderm between entoderm and ectoderm. (I) Late gastrula, horizontal section, showing yolk plug, mesoderm, and final engulfment of blastocoelic space by entoderm.

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  • bookid:comparativeembry00nels
  • bookyear:1953
  • bookdecade:1950
  • bookcentury:1900
  • bookauthor:Nelsen_Olin_E_Olin_Everett_b_1898
  • booksubject:Vertebrates_Embryology
  • booksubject:Comparative_embryology
  • bookpublisher:New_York_Blakiston
  • bookcontributor:MBLWHOI_Library
  • booksponsor:MBLWHOI_Library
  • bookleafnumber:435
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/20047812224. It was reviewed on 27 sentyabr 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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[[Category:Blastula]

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