From Embryology

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(Chromic acid preparation.)

f.b. front-brain : mb. mid-brain ; h. b. hind-brain ; op.v. optic vesicle ; au.p. auditory pit ; o.f. vitelline vein ; p.v. mesoblastic somite; m.f. line of junction of the medullary folds above the medullary canal ; s.r. sinus rhomboidalis ; t. tail-fold ; p.r. remains of primitive groove (not satisfactorily represented) ; a.p. area pellucida.

The line to the side between p.v. and m.f. represents the true length of the embryo.

The fiddle-shaped outline indicates the margin of the pellucid area. The head, which reaches as far back as o.f., is distinctly marked off; but neither the somatopleuric nor splanchnopleuric folds are shewn in the figure ; the latter diverge at the level of o./., the former considerably nearer the front, somewhere between the lines m.b. and h. b. The optic vesicles op.v. are seen bulging out beneath the superficial epiblast. The heart lying underneath the opaque body cannot be seen. The tail-fold t. is just indicated ; no distinct lateral folds are as yet visible in the region midway between head and tail. At m.f. the line of junction between the medullary folds is K still visible, being lost forwards over the cerebral vesicles, while behind may be seen the remains of the sinus rhomboidalis, s.r.

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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)


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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Yi efo/eka'e gwa ebo wo le nyangagi wuncin ye kamina wunga tinya nan

current07:40, 9 January 2011Thumbnail for version as of 07:40, 9 January 2011740 × 887 (86 KB)S8600021 (talk | contribs)FIG. 27. EMBRYO OF THE CHICK BETWEEN THIRTY AND THIRTY-SIX HOURS, VIEWED FROM ABOVE AS AN OPAQUE OBJECT. (Chromic acid preparation.) f.b. front-brain : mb. mid-brain ; h. b. hind-brain ; op.v. optic vesicle ; au.p. auditory pit ; o.f. vitelline vein ; p