File:Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus (1953) (20643683896).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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ANATOMICAL FEATURES was used in reference to the female organ. The use of the word "ovary" was introduced by Steno in 1667, and also by de Graaf (fig. 1) in 1672 in his work on the female generative organs. To quote from de Graaf: "Thus, the general function of the female testicles is to generate the ova, to nourish them, and to bring them to maturity, so that they serve the same purpose in women as the ovaries of birds. Hence, they should rather be called ovaries than testes because they show no similarity, either in form or contents, with the male testes properly so called." (See Corner, '43.) From the time of de Graaf the word "testis" has been restricted to designate the male organ essential to reproduction. The phrase "essential to reproduction" does not describe fully the impor- tance of testicular function. As we shall see later on, the testis not only assumes the major role in the male's activities during the period of reproduction, but also, in the interim between specific reproductive periods, it governs in many instances male behavior leading to protection and preservation of the species. Thus, the testis is the organ responsible for maleness in its broader, more vigorous sense. B. Anatomical Features of the Male Reproductive System Before endeavoring to understand the general functions of the testis in re- lation to reproduction, it is best to review some of the structural relationships of the testis in the vertebrate group.
Text Appearing After Image:
Fig. 1. Reinier de Graaf. Born in Holland, 1641; died in Delft, Holland. 1673. Author of important works on the generative organs of the female. Described the Graafian fol- licle in the ovary of mammals but erroneously believed it to be the mammalian egg. (From Corner, '43.)

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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:31
  • 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@N07/20643683896. It was reviewed on 17 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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current15:47, 17 September 2015Thumbnail for version as of 15:47, 17 September 2015926 × 1,246 (297 KB) (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Title''': Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus<br> '''Identifier''': comparativeembry00nels ([https://commons.wikim...

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