File:HamiltonBoyd1960 plate05.jpg

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Plate 5

Fig. 13. Photomicrograph ( x 45) of a section of the implantation site of a 14-day embryo (Missen). Chorionic villi with mesodermal cores are now well established round the whole of the chorionic sac. There is an extensive intervillous space which, in this section, communicates at two points with a large venous sinusoid (S.). Details of the differentiation of the trophoblast in this specimen are shown in PI. 6, fig. 15.

Fig. 14. Photomicrograph ( x 10) of a section of the implantation site of a 28-somite human embryo (Camb. H. 710). Villi which cover the whole of the chorionic sac are well established, and possess numerous foetal vessels. There is no indication of a marginal sinus in the intervillous space ; there is, however, venous drainage from the left margin of this space. The decidua basalis is thick and contains many dilated glands; several of the central ones show haemorrhage into their lumina. The effect of expansion of the chorionic sac on the uterine glands is particularly well shown on the right of the illustration where their necks are constricted and stretched, thus damming back the products of secretion. Veins and spiral arteries can be identified at intervals. in the decidua basalis.

Plates: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13


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 18) Embryology HamiltonBoyd1960 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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