File:Bryce1908 fig03.jpg

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Figure 3. Drawing of a reconstruction wax model of the Blastocyst

The outer darker layer is the cyto-trophoblast ; the inner lighter, the mesoblast represented as if solid. The irregular cavity is the retraction cavity in the mesoblast. It contains two vesicles ; the larger is the torn and collapsed amnio-embryonic vesicle, the smaller is the entodermic vesicle.

The model was constructed by building up wax plates to represent what was really a cast of the cavity of the blastocyst, with a space in ita centre containing the vesicles. The model was then cut across so as to present to view the portion of the retraction cavity containing both vesicles. This portion of the model was then cast in plaster of Paris, and an outer case constructed which represents in a diagrammatic fashion the cellular layer ol the blastocyst wall.

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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)


Bryce, T.H. & Teacher, J.H. (1908). An Early Ovum Imbedded In The Decidua. Glasgow: James Maclehose and Sons.

Bryce, T.H., Teacher, J.H. & Munro Kerr, J.M. (1908). An Early Ovarian Pregnancy. Glasgow: James Maclehose and Sons.

Cite this page: Hill, M.A. (2024, June 23) Embryology Bryce1908 fig03.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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