File:Foster004.jpg

FIG. 4. SECTION THROUGH THE GERMINAL Disc OF THE RIPE OVARIAN OVUM OF A FOWL WHILE YET ENCLOSED IN ITS CAPSULE.

a. Connective-tissue capsule of the ovum.

b. follicular epithelium, at the surface of which nearest the ovum lies the vitelline membrane,

c. granular material of the germinal disc, which becomes converted into the blastoderm. (This is not very well represented in the woodcut. In sections which have been hardened in chromic acid it consists of fine granules.)

w.y, white yolk, which passes insensibly into the fine granular material of the disc.

x, germinal vesicle enclosed in a distinct membrane, but shrivelled up by the action of the chromic acid,

y, space originally completely filled up by the germinal vesicle, before the latter was shrivelled up by the action of the chromic acid.

Embryology - 23 Apr 2024        Expand to Translate
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Foster M. Balfour FM. Sedgwick A. and Heape W. The Elements of Embryology (1883) Vol. 1. (2nd ed.). London: Macmillan and Co.

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The Elements of Embryology - Volume 1 (1883)

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 | Appendix

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