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Plate 13 Placental Structure

Fig. 37. Scheme to show the essential features in placental structure which are found after the 60 mm. stage.

Three cotyledons, including a marginal one, are illustrated; the cotyledons are separated from each other on the maternal side by the septa. They each contain the group of villi which constitute the associated ‘foetal’ cotyledon.

The villi branch freely and there are many adhesions between adjacent ones so giving a partially labyrinthine nature to the intervillous space. Such villi are shown in relief in the marginal cotyledon and in section in the adjacent one.

The third cotyledon has been dissected to show the arrangement of the septa. The openings of the endometrial arteries and veins into the intervillous space through the basal plate are indicated and an attempt has been made to show the probable degree of oxygenation of the maternal blood in the intervillous space.

A marginal sinus in the intervillous space has not been included in the scheme as our material does not show such a feature.

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, May 22) Embryology HamiltonBoyd1960 plate13.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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