File:HamiltonBoyd1960 plate01.jpg: Difference between revisions

Plate 1

Fig. 1. A drawing ( x 140) of a section through the middle of an implantation site at the 11th-12th day of development (Barnes embryo).

The surface view of the implantation site is shown in Pl. 2, fig. 2.

The blastocystic trophoblast has differentiated into primitive syncytium and cytotrophoblast ; the latter surrounds the primitive mesoblast which almost completely fills the © original blastocyst cavity. At intervals the cytotrophoblast has proliferated to form projections which are the forerunners of the ‘primary villi’. The primitive syncytium, which has not yet extended completely round the superficial aspect of the implantation site, shows an extensive development of intercommunicating lacunae containing some maternal blood cells. The endometrium surrounding the implanted ovum is oedematous and there is haemorrhage into a uterine gland in contact with the syncytium.

Photomicrographs of selected portions of the trophoblast of this specimen are illustrated in Pl. 4, figs. 9-12.

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Reference

Hamilton WJ. and Boyd JD. Development of the human placenta in the first three months of gestation. (1960) J Anat. 94(3): 297-328. PMID14399291 | PDF

Cite this page: Hill, M.A. (2024, April 19) Embryology HamiltonBoyd1960 plate01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:HamiltonBoyd1960_plate01.jpg

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