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From Embryology

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FIG. 29. DIAGRAMMATIC LONGITUDINAL SECTION THROUGH THE Axis OF AN EMBRYO.

The section is supposed to be made at a time when the headfold has commenced but the tail-fold has not yet appeared.

N.C. neural canal, closed in front but as yet open behind. Ch. notochord.

The section being taken in the middle line, the protovertebrae are of course not shewn.

In front of the notochord is seen a mass of uncleft mesoblast, which will eventually form part of the skull.

D. the commencing foregut or front part of the alimentary canal.

F. So. Somatopleure, raised up in its peripheral portion into the amniotic fold Am. Sp. Splanchnopleure. At Sp. it forms the under wall of the foregut ; at F. Sp. it is turning round and about to run forward.

Just at its turning point the cavity of the heart Ht. is being developed in its mesoblast. pp. pleuroperitoneal cavity. A epiblast, B mesoblast, C hypoblast, indicated in the rest of the figure by differences in the shading.

At the part where these three lines of reference end the mesoblast is as yet uncleft.



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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

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current07:51, 9 January 2011Thumbnail for version as of 07:51, 9 January 2011950 × 437 (51 KB)S8600021 (talk | contribs)FIG. 29. DIAGRAMMATIC LONGITUDINAL SECTION THROUGH THE Axis OF AN EMBRYO. The section is supposed to be made at a time when the headfold has commenced but the tail-fold has not yet appeared. N.C. neural canal, closed in front but as yet open behind. Ch