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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.
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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)
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current | 14:59, 8 January 2011 | 1,002 × 314 (45 KB) | S8600021 (talk | contribs) | 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 |
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