The elements of embryology. / By M. Foster ... and Francis M. Balfour.

  • Michael Foster
Date:
1874
Catalogue details

Licence: Public Domain Mark

Credit: The elements of embryology. / By M. Foster ... and Francis M. Balfour. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    CH. v.] for though it will afterwards become larger it will at the same time become less definite and less important. We may therefore, before we proceed, add a few words to the description of it given in the last chapter. Fig. 23. AA DUGRAM OF THE CIRCULATION OP THE YoLK-SaOK AT THE END OF THE Third Day op Incubation. H. heart. AA. the second, third and fourth aortic arches; the first has becorne obliterated in its median portion, but is continued at its proximal end as the external carotid, and at its distal end as the internal carotid. AO. dorsal aorta. L. Of. A. left oraphalo-mesaraic artery. R.Of.A.righi omphalo-mesaraic artery. S. sinus terininalis. L. Of. left oinphalo-mesaraio vein. R. Of. right omplialo-mesaraic vein. S. V. sinus veuosus. D. G. ductus Cuvieri. S. Ca. V. superior oardin;il vein. V.Ca. inferior cardinal vein. The veins are marked in outline and the arteries are made black. The whole blastoderm has been removed from the egg and is supposed to be viewed from below. Hence the left is seen on the right, and vice versa.