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FIG. 25. FOUR TRANSVERSE SECTIONS THROUGH THE NEURENTERIC PASSAGE AND ADJOINING PARTS IN A DUCK EMBRYO WITH TWENTY-SIX MESOBLASTC SOMITES.

A. Section in front of the neurenteric canal, shewing a lumen in the notochord.

B. Section through the passage from the medullary canal into the notochord.

C. Section shewing the hypoblastic opening of the neurenteric canal, and the groove on the surface of the primitive streak, which opens in front into the medullary canal.

D. Primitive streak immediately behind the opening of the neurenteric passage.

me. medullary canal ; ep. epi blast ; hy. hypoblast ; ch. notochord ; pr. primitive streak.

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Reference

Foster, M., Balfour, F. M., Sedgwick, A., & Heape, W. (1883). The Elements of Embryology. (2nd ed.). London: Macmillan and Co.

The Elements of Embryology (1883)

Volume 1 The History of the Chick: Egg structure and incubation beginning | Summary whole incubation | First day | Second day - first half | Second day - second half | Third day | Fourth day | Fifth day | Sixth day to incubation end

Volume 2 The History of the Mammalian Embryo: General Development | Embryonic Membranes and Yolk-Sac | Organs from Epiblast | Organs from Mesoblast | Alimentary Canal | Appendix