File:A text-book of dental histology and embryology, including laboratory directions (1912) (14596977229).jpg

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Identifier: textbookofdent00noye (find matches)
Title: A text-book of dental histology and embryology, including laboratory directions
Year: 1912 (1910s)
Authors: Noyes, Frederick Bogue
Subjects: Teeth
Publisher: Philadelphia and New York, Lea & Febiger
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Diagram showing stages of spermatogenesis as seen in different sections of aseminiferous tubule of a rat: s, Sertoli cell; sc1, spermatocyte of the first order;sc2, spermatocyte of the second order; sg, spermatogone; sp, spermatid; sz, sperma-tozoon. (Von Lenhosseks diagram, from McMurrich.) the male pronucleus, the other the female pronucleus. Theseboth form chromosomes, the number from each being halfthe number typical of the species. These are arranged asusual between the centrosomes. They divide longitudinally,each forming two, one of which passes to either centrosome,where a new nucleus is formed, and in the meantime thecytoplasm has divided so that two cells are formed. Thenuclear material of these two cells has, therefore, beenequally derived from the two parents, and it is to controlall of the future development of the individual. Fig. 261
Text Appearing After Image:
HOLOBLASTIC SEGMENTATION 345 SEGMENTATION Holoblastic Segmentation.—An idea of the development ofthe embryo can perhaps best be obtained by following thedevelopment of the frog. The frogs eggs are large andeasily observed, and they contain only a small amount ofyolk or food material, which does not obstruct the observa-tion. The spherical ovum first divides into hemispheres; these

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https://www.flickr.com/photos/internetarchivebookimages/14596977229/

Author Noyes, Frederick Bogue
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Flickr tags
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  • bookid:textbookofdent00noye
  • bookyear:1912
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Noyes__Frederick_Bogue
  • booksubject:Teeth
  • bookpublisher:Philadelphia_and_New_York__Lea___Febiger
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:379
  • bookcollection:library_of_congress
  • bookcollection:americana
Flickr posted date
InfoField
30 July 2014


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