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Plate 5, fig. 5. Teacher-Bryce Ovum No. 2

One half of the operculuin (Op.) in Section N0. 25.2.1. X 350. The mesoderm (mes.) is retracted from the base of the operculurn. Ch. ep. The chorionic epithelium which becomes more primitive in character with nuclei of irregular shape and size as the operculum is approached.

The cells and nuclei of the operculum are large and vary in size and shape. Those further from the blastocyst wall Show signs of degeneration. There is some Vacuolation of their protoplasin and a few leucocytes are seen among them. The thin membrane with small elongated nuclei on the surface of the operculurn is the remains of the uterine epithelium—ut.ep. Note the diflerent size of the cells of the two structures. Between the operculum and the chorionic epithelium covering the blastocyst there are remains of decidua, thrombus-like material with many leucocytes and the blood in the intervillous space—i.v.sp. The pale granular masses in the blood occur frequently throughout the intervillous space. I am not prepared to make a definite statement as to their nature. Compare fig. 7 and Photos figs. 8 to 10.

Drawn by A. K. Maxwell. Scale : hundredths of millimetre.

Figure Links: text-fig. 1 | text-fig. 2 | text-fig. 3 | text-fig. 4 | text-fig. 5 | plate 1 | plate 2 | plate 3 | plate 4 | plate 11 | fig. 17 | fig. 18 | fig. 19 | Teacher 1925 | Carnegie stage 5 | Carnegie stage 6
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Teacher JH. On the implantation of the human ovum and the early development of the trophoblast. (1925) J Obst. Gynaecol. 31(2); 166-217.

Cite this page: Hill, M.A. (2024, February 24) Embryology Teacher1925 plate05.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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