File:Foster050.jpg

FIG. 50.

A. Diagrammatic section taken perpendicular to the plane of the paper, along the line y, y, Fig. 49. The stalk is not seen, the* section falling quite out of its region, vh, hollow of optic cup filled with vitreous humour ; other letters as in Fig. 47 B.

B. Section taken parallel to the plane of paper through Fig. 49, so far behind the front surface of the eye as to shave off a small portion of the posterior surface of the lens I, but so far in front as not to be carried at all through the stalk. Letters as before ; /, the choroidal fissure.

C. Section along the line z, z, perpendicular to the plane of the paper, to shew the choroidal fissure /, and the continuity of the cavity of the optic stalk with that of the primary optic vesicle. Had this section been taken a little to either side of the line z, 2, the wall of the optic cup would have extended up to the lens below as well as above. Letters as above.

Historic Disclaimer - information about historic embryology pages

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