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Plate 5

(Further details concerning the figures on this plate will be found in the text.)

Fig. 9.

  • Section 12-1-2. X 350 Portion of body-stalk low down, showing blood-islands in left umbilical artery.
  • Toward the yolk-sac, above in the illustration, the lumen of the artery communicates freely with the spaces in the mesenchyme.

Fig. 10.

  • Section 12-1-6. X 350. Right umbilical artery in body-stalk, at a slightly higher level than figure 9.
  • The vessel wall is here much better defined than that shown in figure 9.
  • The blood-island i£ also less dense and almost free within the vessel.
  • Toward the yolk-sac the changes in the vessel wall and relation of its lumen to the wide tissue spaces in front can be seen.
  • This represents the first indication of a connection between the vessels in the embryo and those of the body-stalk; in this case between the right dorsal aorta and the right umbilical artery, through the intermediation of the caudal portion of the vitelline plexus and of the vitelline artery.

Fig. 11.

  • Section 12-3-5. X 350. Detail of text-figure a. Section through heart, about the middle of the organ.
  • The thickening of the mantle on the right side of the heart is only apparent, being due to the sudden change in curvature at this level.

Fig. 12.

  • Section 12-2-6. X 600. Caudal end of left dorsal aorta, represented by an elongated blood island.
  • Beginning lumen formation near its posterior end.
  • The mesoderm in this region has not yet begun to segment.
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 22) Embryology Ingalls1920plate05.jpg. Retrieved from

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