File:GladstoneHamilton1941 text-fig07.jpg

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Text-fig. 7. Section through the anterior part of the embryonic rudiment showing amnion, embryonic plate, and wall of the yolk sac

The wide cavity beneath the embryonic plate is believed to be the foregut. The mesoblastic tissue between the embryonic ectoderm and the entoderm is here scanty and in the section appears incomplete, this section lying in the presumptive region of the buccopharyngeal membrane. The mesenchymal cleft to the left in the figure, and the enclosed space in the corresponding situation on the right, correspond in position to the future pericardial cavity. Apart of the anterior wall of the yolk sac is seen in the lower part of the photograph. Empty spaces lined by endothelial cells are present in the wall of the yolk sac and embryonic plate. Section no. 6. x 100.

Online Editor - "entoderm" = endoderm


Gladstone RJ. and Hamilton WJ. A presomite human embryo (Shaw) with primitive streak and chorda canal with special reference to the development of the vascular system. (1941) Amer. J Anat. 76(1): 9-44.

Cite this page: Hill, M.A. (2024, February 24) Embryology GladstoneHamilton1941 text-fig07.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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