File:HamiltonBoyd1960 fig08.jpg

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Fig. 8.

Photograph ( x 2) of section through a portion of the uterus to show the placenta and chorionic sac containing a 36 mm. embryo (Camb. H. 789.).

The basal placental plate separating the chorionic villi and the intervillous space from the decidua basalis appears as a thin band across the greater part of the attachment area. The decidua basalis, though of variable thickness, is still very distinct.

The placental (i.e. lower) half of the decidua capsularis has chorionic villi related to it projecting into an associated extension of the intervillous space. The upper part of the decidua capsularis, together with the abembryonic portion of the chorion, is markedly attenuated. Consequently in this region the interior of the chorionic sac is separated from the uterine lumen by only a very thin double layer of foetal and maternal tissue.

The decidua vera can be seen on either side of the placenta extending up to the cut margin of the uterine wall.

Note the presence of uterine veins throughout the decidua basalis and the absence of any region of the intervillous space which could be identified as a marginal sinus.

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 23) Embryology HamiltonBoyd1960 fig08.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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