File:Foster040.jpg

FIG. 40. SECTION THROUGH THE HIND-BRAIN OF A CHICK AT THE END OF THE THIRD DAY OF INCUBATION.

IV. Fourth ventricle. The section shews the very thin roof and thicker sides of the ventricle.

Ch. Notochord (diagrammatic shading).

CV. Anterior cardinal or jugular vein.

CC. Involuted auditory vesicle. CC points to the end which will form the cochlear canal. RL. Kecessus labyrinthi. hy. hypoblast lining the alimentary canal, hy is itself placed in the cavity of the alimentary canal, in that part of the canal which will become the throat. The ventral (anterior) wall of the canal is not shewn in the section, but on each side are seen portions of a pair of visceral arches. In each arch is seen the section of the aortic arch AOA belonging to the visceral arch. The vessel thus cut through is running upwards towards the head, being about to join the dorsal aorta AO. Had the section been nearer the head, and carried through the plane at which the aortic arch curves round the alimentary canal to reach, the mesoblast above it, AOA and AO would have formed one continuous curved space. In sections lower down in the back the two aortse, AO, one on each side, would be found fused into one median canal.

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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