File:Foster049.jpg

FIG. 49. DlAGRAMMATIC REPRESENTATION OF THE EYE OF THE CHICK OF ABOUT THE THIRD DAY AS SEEN WHEN THE HEAD IS VIEWED FROM UNDERNEATH AS A TRANSPARENT OBJECT.

I the lens, I' the cavity of the lens, lying in the hollow of the optic cup. r the anterior, u the posterior wall of the optic cup, c the cavity of the primary optic vesicle, now nearly obliterated. By inadvertence u has been drawn thicker than r, it should have been thinner throughout. s the stalk of the optic cup with s its cavity, at a lower level than the cup itself and therefore out of focus ; the dotted line indicates the continuity of the cavity of the stalk with that of the primary vesicle. The line 0, 0, through which the section shewn in Fig. 50 C is supposed to be taken, passes through the choroidal fissure.

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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