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Fig. 3. Chorion, body-stalk, and embryo, the last on sagittal section

  • view as in figure 1. X 90.
  • Ectoderm is shown in yellow, entoderm in green, vessels in red.
  • Chorion shows numerous small vessels and the slender connection with the large venous plexus of body-stalk.
  • Lower anastomosis between umbilical artery and ventral venous plexus not shown.
  • Distal portion of allantois in contact with mesothelium of body-stalk.
  • Primitive streak between primitive node and cloacal membrane.
  • Heart plexus suspended between myoepicardial mantle and fore-gut (cf. figs. 7 and 8 on plate 4). Line of section 12-3-6, text-figure a, is indicated.

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 16) Embryology Ingalls1920plate02.jpg. Retrieved from

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