. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 164 THE DEVELOPMENT OF THE GAMETES OR SEX CELLS and "test" cells of the egg of Styela were ejected from the surface cytoplasm at the time of ovulation (Conklin, '05). A recent view, however, maintains that the test cells arise from follicle cells and come to lie in indentations of the periphery of the egg outside of the thin vitelline membrane (Tucker, '42). The chorion is formed by the inner layer of follicle cells and comes to lie betw
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 164 THE DEVELOPMENT OF THE GAMETES OR SEX CELLS and "test" cells of the egg of Styela were ejected from the surface cytoplasm at the time of ovulation (Conklin, '05). A recent view, however, maintains that the test cells arise from follicle cells and come to lie in indentations of the periphery of the egg outside of the thin vitelline membrane (Tucker, '42). The chorion is formed by the inner layer of follicle cells and comes to lie between the test cells and the inner layer of follicle cells in the mature egg (fig. 91 A). At ovulation the chorion moves away from the surface of the oocyte. At this time also, the test cells move outward from their indentations in the peripheral ooplasm and come to lie in the perivitelline space between the egg surface and the chorion (fig. 9IB). An ooplasmic membrane which. TH EGA FOL LI CULI GRANULOSA MICROPYLAR CELL ZONA RADIATA YOL K. 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 Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, bookleafnumber190
