Paper - The Comparative Behavior of Mammalian Eggs in Vivo and in Vitro

From Embryology
Revision as of 10:20, 15 November 2015 by Z8600021 (talk | contribs) (Created page with "{{Header}} Pincus G. and Enzmann EV. Paper - The Comparative Behavior of Mammalian Eggs in Vivo and in Vitro|The Comparative Behavior of Mammalian Eggs in Vivo and in Vitro...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.
Embryology - 28 Mar 2024    Facebook link Pinterest link Twitter link  Expand to Translate  
Google Translate - select your language from the list shown below (this will open a new external page)

العربية | català | 中文 | 中國傳統的 | français | Deutsche | עִברִית | हिंदी | bahasa Indonesia | italiano | 日本語 | 한국어 | မြန်မာ | Pilipino | Polskie | português | ਪੰਜਾਬੀ ਦੇ | Română | русский | Español | Swahili | Svensk | ไทย | Türkçe | اردو | ייִדיש | Tiếng Việt    These external translations are automated and may not be accurate. (More? About Translations)

Pincus G. and Enzmann EV. The Comparative Behavior of Mammalian Eggs in Vivo and in Vitro. (1935) J Exp Med. 62(5):665-75. PMID 19870440

Historic Embryology Papers

Historic Disclaimer - information about historic embryology pages 
Mark Hill.jpg
Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

The Comparative Behavior of Mammalian Eggs In Vivo And In Vitro

I. The Activation of Ovarian Eggs

By Gregory Pincus, S.D., And E. V. Enzmann, Ph.D.

(From the Biological Laboratories, Harvard University, Cambridge)

This investigation has been aided by a grant from the National Research Council Committee for Problems of Sex.

PLATES 29 AND 30

(Received for publication, July 17, 1935)

The eggs of most mammals are shed from the ovary with the first polar body formed. The mechanism controlling this stage of maturation has never been investigated in detail. Furthermore, under normal conditions only shed ova are fertilized. Does this indicate that the first maturation division is an essential prelude to fertilization? Or may ovarian eggs in fact be activated before the first meiotic division?


This investigation concerns itself with these problems, and falls into two parts dealing with: (1) the mechanism controlling the first meiotic division; (2) the capacity for fertilization of ovarian eggs. Superficially unrelated, these two studies are aspects of the broad problem of the fundamental nature of the activation process.

Experimental

The rabbit is especially favorable material for this study since it ovulates only after copulation. It has been established that copulation results in a stimulation of pituitary secretion, and that the amount of anterior pituitary secretion necessary to induce ovulation occurs during the 1st hour after copulation (Deansley, Fee, and Parkes, 1930). The injection of pituitary extracts or of prolan induces ovulation (Friedman, 1929); and furthermore, ovulation induced by stimulating hormones occurs at 10 hours after injection (Bellerby, 1929). Ova are normally shed with the first polar body at 10 hours after copulation. According to Heape (1905) both polar bodies are formed at 9 hours after copulation.


Heape’s statement is but partially correct. Only one polar body is formed. We have investigated this situation in detail, and our data are summarized in Table I. Before copulation occurs the ovum contains a single large vesicular nucleus about 30 microns in diameter (Fig. 1). At 2 hours after copulation some



Cite this page: Hill, M.A. (2024, March 28) Embryology Paper - The Comparative Behavior of Mammalian Eggs in Vivo and in Vitro. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_Comparative_Behavior_of_Mammalian_Eggs_in_Vivo_and_in_Vitro

What Links Here?
© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G