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Plate 3

Fig. 4. Vascular system as seen from the right side

  • X 100. Color scheme as in figure 3.
  • The ectoderm has been cut away close to the border of the medullary folds.
  • The mesoderm of the embryo and adjacent yolksac has been removed to show the vessels embedded in it.
  • In the vitelline plexus and that part of it which represents the yolk-sac portion of the vitelline (umbilical) artery, the endothelial vessels are represented in darker color than the less definitely lined channels.
  • The same is true for the anterior portion of the dorsal aorta and the isolated vesicles in the roof of the fore-gut.
  • Scattered blood-islands and other vascular formations are seen through the mesoderm of the yolk-sac.
  • Anterior to the branch of the aorta (marked vitelline artery) is a second, more doubtful connection between the aorta and the vitelline plexus.

Embryo at Segmentation: Figure A | Plate 1 | Plate 2 | Plate 3 | Plate 4 | Plate 5 | Carnegie stage 9 | Carnegie Embryo 1878


Ingalls NW. A human embryo at the beginning of segmentation, with special reference to the vascular system. (1920) Contrib. Embryol., Carnegie Inst. Wash. Publ. 274, 11: 61-90.

Cite this page: Hill, M.A. (2024, June 12) Embryology Ingalls1920plate03.jpg. Retrieved from

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