Archive image from page 45 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 28 THE DEVELOPMENT OF THE CHICK line membrane (Fig. 7). It becomes elliptical, and later the outer surface is flattened against the vitelline membrane, the inner surface remaining convex (Fig. 8). The point on the surface to which the germinal vesicle migrates is situated away from the surface of the ovary, and thus in the position of the pedicle of -- ''...''â 'fii. â = - )1 fl - iT ' ' Fig. 7. â Section of an ovarian ovum of th
Archive image from page 45 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 28 THE DEVELOPMENT OF THE CHICK line membrane (Fig. 7). It becomes elliptical, and later the outer surface is flattened against the vitelline membrane, the inner surface remaining convex (Fig. 8). The point on the surface to which the germinal vesicle migrates is situated away from the surface of the ovary, and thus in the position of the pedicle of -- ''...''â 'fii. â = - )1 fl - iT ' ' Fig. 7. â Section of an ovarian ovum of the pigeon; drawn from a prepara- tion of Mr. J. T. Patterson. The actual dimensions of the ovum are X mm. f. s., Stalk of folHcle. G. V., Germinal vesicle. Gr., Granulosa. L., Latebra. p. P., Peripheral protoplasm, pr. f., Primordial foUicles. Th. ex., Theca externa. Th. int., Theca interna. Y. Y., Yellow yolk. Z. r., Zona radiata. the follicle, when the latter projects from the surface of the ovary (Fig. 7). This determines the position of the future germ disc. The nucleus increases in size with the growth of the ovum; in the youngest ovocytes its diameter is about 9 /x; in the ripe ovum it is flattened and may measure 455 /x in diameter by 72 ii in thickness.
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