File:GladstoneHamilton1941 plate01.jpg

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Plate 1

1. A drawing of part of the wall of the yolk sac in the abembryonic region showing the diiferent types of developing blood cells lying within, and in the neighbourhood of, a vascular space which is lined with endothelium. Section no. 31, the sections having been numbered from the anterior end of the embryonic disc. x c. 750. Cell no.: 1, haemocytoblast; 2, extravascular haemocytoblast; 3, small haemocytoblast; 4, transitional haemocytoblast; 5, early primitive erythroblast; 6, intermediate primitive erythroblast (with indented nucleus); 7, binucleated primitive erythroblast; 8, intermediate primitive erythroblast; 9, late primitive erythroblast; 10, disintegrating erythroblast; ll, non-nucleated primitive erythrocyte; 12, binucleate giant cell; 13, remains of early blood cell.

2. A drawing of part of the wall of the yolk sac near to its attachment to the embryonic disc. A well-formed blood island is seen in the right of the drawing. Cell no. 1 is a haemocytoblast and no. 9 a late primitive erythroblast. No. 14 shows the formation of an angiocyst in relation with the mesothelium. No. 15 shows a cell undergoing vacuolation (? transfbrmation into an endothelial cell), the contents being discharged to contribute to embryonic plasma. A large vacuole is formed in one of the entodermal cells; other entodermal cells have ‘ragged’ edges suggesting that they have discharged their vacuoles into the yolk sac. Section no. 31. x c. 750.


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 28) Embryology GladstoneHamilton1941 plate01.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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current17:46, 26 February 2017Thumbnail for version as of 17:46, 26 February 20171,280 × 1,793 (411 KB)Z8600021 (talk | contribs)
17:46, 26 February 2017Thumbnail for version as of 17:46, 26 February 20171,610 × 2,534 (647 KB)Z8600021 (talk | contribs)===Reference=== {{Ref-GladstoneHamilton1941}} {{Footer}} Category:Carnegie Embryo 1399