. The development of the chick; an introduction to embryology. Birds -- Embryology. 28 THE DEVELOPMENT OF THE CHICK Although the nuculeus (germinal vesicle of authors) may be excentric in position in the youngest ovocytes, it always occupies an approximately central position in those slightly older. The nucleus increases in size with the growth of the cell-body; in the youngest ovocytes its diameter is about 9 /x. and. Fig. 7. — 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 foll
. The development of the chick; an introduction to embryology. Birds -- Embryology. 28 THE DEVELOPMENT OF THE CHICK Although the nuculeus (germinal vesicle of authors) may be excentric in position in the youngest ovocytes, it always occupies an approximately central position in those slightly older. The nucleus increases in size with the growth of the cell-body; in the youngest ovocytes its diameter is about 9 /x. and. Fig. 7. — 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 follicle. G. V., Germinal vesicle. Gr., Granvilosa. L., Latebra. p. P., Peripheral protoplasm, pr. f., Primordial follicles. Th. ex., Theca externa. Th. int., Theca interna. Y. Y., Yellow yolk. Z. r., Zona radiata. in the ripe ovum it is flattened and measures about 117 x 315 fi. It retains its central position until the ovum is about mm. in diameter, and then moves to the surface where it lies almost in contact with the vitelline membrane (Fig. 7). It becomes elliptical, and later the outer surface is fiat-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947. New York, Holt
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