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Fig. 2. Human ovum in discus proligerus in propnase of first division

Fig. 2 shows an ovum in discus proligerus in Graafian follicle. Section 0.007 mm thick. Stained with Ehrlich’s acid haematoxylin and eosin. x 600.

Note - discus proligerus is an historic term for granulosa cells surrounding the oocyte and forming the cumulus oophorus.

From a woman aged 22. Died of a femoral hernia. Same ovary as fig. 1. The figure shows that the egg is not spherical. The cells of the Corona radiata are here adherent to the outer side of the Zona pelluci(la by broader protoplasmic processes than in fig. 1, with arcaded spaces in between them, the summits of the arcades being directed to the Zona pellucida. The Zona pellucida consists clearly of two layers, the combined thickness of which amounts to from 0.008 to 0.O11 mm. The three deeply stained bodies seen overlying the Zona pellucida are nuclei which have got floated over it in the process of mounting. The inner zone is more homogeneous than the outer, it exhibits here and there evidence of a lamellar arrangement and at one or two points there seems to be distinct proof of the presence of cellular elements in its substance. At one pole it appears to be faintly striated radially. This layer of the Zona pellucida I have reason to believe is the ovular layer. The outer layer, continuous with the processes which pass to the cells of the Corona radiata is more open and fibrillar in structure. This I believe to be the ovarian layer of the Zona pellucida, the Zona thus‘ being a compound structure made up of ovular and ovarian elements. The cytoplasm, of granular appearance, is fairly uniform in density throughout. It is retracted from the inner surface of the Zona pellucida, the retraction cavity being slit-like for the most part, but increased in width towards one end, where it forms a considerable cavity, which is in part occupied by a ‘faintly granular translucent material capping the substance of the cytoplasm at this end of the egg. This is possibly of the nature of a coagulum.


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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)
Human Ovum Links: Fig 1. Prophase I | Fig 2. | | Fig 3. | Plate 10 | Plate 11 | Plate 12
Online Editor Notes  
  • discus proligerus is an historic term for granulosa cells surrounding the oocyte and forming the cumulus oophorus.
  • meiosis staging cannot be correct as described in text, as human oocyte completes meiosis I at ovulation and only completes meiosis II at fertilization.
  • See also paper by P N Odgers An Early Human Ovum (Thomson) in situ. J. Anat.: 1937, 71(Pt 2);161-168.3 PMID 17104634, describing an early embryo from Prof. Arthur Thomson
Nature Obituary 1935 - Prof. Arthur Thomson (1858 - 1935)
"ON his retirement in 1933, Prof. Arthur Thomson, whose death on February 7 will be widely regretted, had completed a somewhat unusual record of academic service. He was born on March 21, 1858, and for forty-eight years he represented human anatomy at the University of Oxford, first as University lecturer in human anatomy and afterwards as Dr. Lee’s professor of anatomy. After serving an apprenticeship in the famous school of anatomy at Edinburgh under Sir William Turner, Thomson went to Oxford in 1885. Unlike many of his later contemporaries, he did not enjoy the advantage of stepping into a department already equipped for teaching and research. On the contrary, the task fell to him of building up a new department from its very foundations. It will readily be appreciated that Thomson’s energies were fully employed for a number of years in developing the teaching side of his department to a level appropriate to the medical faculty of the University of Oxford, a task which was rendered very laborious at first by the criticism and opposition of some members of the University who were less ready to appreciate the importance of catering for an extensive and detailed medical curriculum."

Nature 135, 295-295 (23 February 1935) | doi:10.1038/135295a0

Modern Notes: oocyte | Category:Oocyte | meiosis


Fertilization Links: fertilization | oocyte | spermatozoa | meiosis | | ovary | testis | menstrual cycle | zona pellucida | zygote | granulosa cell Lecture - Fertilization | 2016 Lecture | mitosis | Lecture - Week 1 and 2 | hydatidiform mole | Assisted Reproductive Technology | | morula | blastocyst | Lecture - Genital Development | Category:Fertilization
Historic Embryology - Fertilization 
1910 Fertilization | 1919 Human Ovum | 1921 The Ovum | 1927 First polar body | 1929 Oocyte Size | 1943 Fertilization | 1944 In vitro fertilization | 1948 In vitro fertilization


Reference

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Cite this page: Hill, M.A. (2024, April 16) Embryology Thomson1919 fig02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Thomson1919_fig02.jpg

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current13:41, 6 August 2015Thumbnail for version as of 13:41, 6 August 20151,172 × 1,233 (354 KB)Z8600021 (talk | contribs)
13:40, 6 August 2015Thumbnail for version as of 13:40, 6 August 20151,277 × 1,388 (524 KB)Z8600021 (talk | contribs)==Fig. 2. == '''Note''' - ''discus proligerus'' is an historic term for granulosa cells surrounding the oocyte and forming the cumulus oophorus. {{Thomson1919 figures}}

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