File:Rugh 046.jpg

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Production of ova and the process of ovulation

(Top) Section through a primary oocyte of Rana pipiens showing the absence of the vitelUne membrane, the presence of the follicle and cyst wall, and the predetermined area of ultimate follicular rupture. {Center) Mature ovum with axial gradient of pigment and yolk. The vitelline membrane is now present, and the cyst wall of smooth muscle cells is stretched.

(Bottom) Ovarian egg partially emerged from its follicle during ovulation. Note degree of constriction, contraction of cyst wall, and fully developed vitelline membrane around the entire egg.

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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)
Frog Development (1951): 1 Introduction | 2 Rana pipiens | 3 Reproductive System | 4 Fertilization | 5 Cleavage | 6 Blastulation | 7 Gastrulation | 8 Neurulation | 9 Early Embryo Changes | 10 Later Embryo or Larva | 11 Ectodermal Derivatives | 12 Endodermal Derivatives | 13 Mesodermal Derivatives | 14 Summary of Organ Appearance | 15 Glossary | 16 Bibliography | Figures


Rugh R. Book - The Frog Its Reproduction and Development. (1951) The Blakiston Company.

Cite this page: Hill, M.A. (2024, June 14) Embryology Rugh 046.jpg. Retrieved from

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

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