File:Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus (1953) (20482460570).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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INTRODUCTION 463 during gastrulation. However, the disappearance of the blastocoehc space is more apparent than real. For, while most of the original blastocoelic space is thus occupied and obliterated, a part of the original blastocoel does remain as an extremely thin, potential area between the outside ectoderm and the mesoderm-entoderm complex of cells. In flattened blastoderms, as in the chick, the actual space between the ectoderm, mesoderm, and entoderm is considerable (fig. 234E, F). To sum up: Though the blastocoelic space ap- pears to disappear during the terminal phases of gastrulation, a residual or potential space remains between the three germ layers, more pronounced in some species than in others. This residual space gradually increases during the tubulation processes of the major organ-forming areas. In doing so, it permits not only the tubulation of these areas within the outside ectoderm, but it allows important cell migrations to occur between the various body tubes. 6. Primitive Circulatory Tubes or Blood Vessels Accompanying the tubulations of the epidermal, neural, entodermal, and the two mesodermal areas on either side of the notochord, is the formation
Text Appearing After Image:
Fig. 221. Transverse sections through early neural fold embryo of the frog as shown in fig. 220A and B. (A-J) Sections are indicated in fig. 220B by lines A-J, respectively. Observe that the dorsal arching (dorsal upgrowth) movement of the dorsally situated tissues accompanies neural tube formation.

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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:489
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
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18 August 2015
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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@N07/20482460570. It was reviewed on 27 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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