File:Foster033.jpg

FIG. 33. SURFACE VIEW FROM BELOW OF A SMALL PORTION OF THE POSTERIOR END OF THE PELLUCID AREA OF A THIRTY-SIX HOURS' CHICK.

To illustrate the formation of the blood-capillaries and blood-corpuscles, magnified 400 diameters.

b.c. Blood-corpuscles at a nodal point, already beginning to acquire a red colour. They are enclosed in a layer of protoplasm, in the outermost part of which are found nuclei, a. These nuclei subsequently become the nuclei of the cells forming the walls of the vessels. The nodal groups are united by protoplasmic processes (p*pr\ also containing nuclei with large nucleoli (ri).

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

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