File:Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus (1953) (20049543203).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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486 DEVELOPMENT OF PRIMITIVE BODY FORM
Text Appearing After Image:
Fig. 236. Transverse sections through chick embryo of about 12 to 13 pairs of somites, about 38 hours of incubation. (Approximately between stages 10 to 11 of Hamburger and Hamilton, '51, slightly older than that shown in fig. 235.) Observe that the optic vesicles are constricting at their bases; heart is bent slightly to the right; anterior neuropore is evident. (A) Optic vesicles. (B) Stomodaeal area. (C) Anterior end of develop- ing heart. (D) Caudal extremity of forming heart. (E) Anterior intestinal portal and forming caudal portion of the heart. (F) Well-developed somites. (G) Open neural groove. below the notochord to complete the roof of the midgut (figs. 201D; 209C; 21 OF; 213). This process is similar to that which occurs in the Amphibia (cf. fig. 219D). (2) A dorsal arching or evagination of the entoderm toward the noto- chordal area, comparable to that found in the frog and other Am- phibia, is present also. A study of figures 213H-J; 217G; 234B; 237E-G; 241B-D demonstrates the marked dorsal upgrowth of all the forming body layers in the trunk area. (Note: In the elasmobranch fishes, a subnotochordal rod of cells of entodermal origin is formed similar to that in the frog and other Amphibia.) (3) The ventro-lateral walls of the midgut area, in contrast to those found in the frog, are established largely by actual ingrowth of the entoderm, mesoderm, and ectoderm with subsequent fusion in the median line

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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:512
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
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18 August 2015
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