. The physiology of reproduction. Reproduction. 450 THE PHYSIOLOGY OF REPRODUCTION With the changes in the mucosa, changes also take place in the trophoblast. After the thinning already mentioned, its cells increase in number. They grow in strands, leaving spaces between them Uke the meshes of a net, and in the spaces maternal blood circulates. In this respect the hedgehog differs. Fig. 112.—Section in situ of the ovum of Erinaceus (Hubreoht). Hy., hypoblast; Tr,, trophoblast; sp., spaces in the trophoblast, communi- cating with the maternal blood-spaces () ; D., deoidua; Trs., trophospon
. The physiology of reproduction. Reproduction. 450 THE PHYSIOLOGY OF REPRODUCTION With the changes in the mucosa, changes also take place in the trophoblast. After the thinning already mentioned, its cells increase in number. They grow in strands, leaving spaces between them Uke the meshes of a net, and in the spaces maternal blood circulates. In this respect the hedgehog differs. Fig. 112.—Section in situ of the ovum of Erinaceus (Hubreoht). Hy., hypoblast; Tr,, trophoblast; sp., spaces in the trophoblast, communi- cating with the maternal blood-spaces () ; D., deoidua; Trs., trophospongia. from the Rodents, in which the prohferation of the trophoblast is confined to the allantoic region. In the hedgehog the pro- hferation occurs even in the omphaloidean region, which is vascularised by the area vasculosa. Here the vacuolated trophoblast is gradually interlocked with vascular processes of the mesoblast, and yoIk-viUi, containing branches of the vitel- hne vessels, are developed. The omphaloidean placenta thus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marshall, F. H. A. (Francis Hugh Adam), 1878-1949; Cramer, William, 1878-1945; Lochhead, James. London, New York, Longmans, Green
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreproduction, bookyea
