. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. CHAPTER II THE DEVELOPMENT PRIOR TO LAYING I. Maturation During the growth period the germinal vesicle has increased to an enormous size (455 x 72 ju in an ovum 37 mm. in diameter, Fig. 8). It lies in contact with the viteUine membrane. The margins of the lenticular nucleus are folded into the interior in such a way that sections give an effect of rod-shaped bodies spring- ing from the membrane which were doubtfully interpreted as. Fig. 8. — Vertical section of germinal vesicle of hen's egg after S
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. CHAPTER II THE DEVELOPMENT PRIOR TO LAYING I. Maturation During the growth period the germinal vesicle has increased to an enormous size (455 x 72 ju in an ovum 37 mm. in diameter, Fig. 8). It lies in contact with the viteUine membrane. The margins of the lenticular nucleus are folded into the interior in such a way that sections give an effect of rod-shaped bodies spring- ing from the membrane which were doubtfully interpreted as. Fig. 8. — Vertical section of germinal vesicle of hen's egg after Sonnenbrodt. Size of egg 37 mm. in diameter; size of nucleus 455 /x x 72 /x. chromosomes by Holl. The real chromosomes are however in the center in the form of double rods (Fig. 8). The maturation divisions of the hen's egg have not been described, but we have fortunately a very good account of the maturation and fertiliza- tion of the pigeon's egg by E. H. Harper, which furnishes the basis of the following description: The wall of the germinal vesicle begins to break down in ovarian eggs of about mm. diameter, the full size of the egg of the pigeon being about 25 mm. Part of the fluid contents of the germinal vesicle flows out and forms a layer outside the disinte- 32. 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 : Henry Holt
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Keywords: ., bookauthorlilliefrankrat, bookcentury1900, booksubjectembryology
