. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 8. FIG. 9. FIG. 10. FIG. n. FIG. 12. FIG. 13. FIGS. 8-13. — The changes through which the central corpuscle and centrosome pass from the prophase of the first maturation spindle to the metaphase of the second maturation spindle. In each case the solid dark body is the central corpuscle. The granular area surrounding the central corpuscle is the cortical zone. Figs, q, 10, and 13 show a complete centrosome, having a central corpuscle and medullary zone. smaller. There is now a distinct cortical zone around the cen- tral
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 8. FIG. 9. FIG. 10. FIG. n. FIG. 12. FIG. 13. FIGS. 8-13. — The changes through which the central corpuscle and centrosome pass from the prophase of the first maturation spindle to the metaphase of the second maturation spindle. In each case the solid dark body is the central corpuscle. The granular area surrounding the central corpuscle is the cortical zone. Figs, q, 10, and 13 show a complete centrosome, having a central corpuscle and medullary zone. smaller. There is now a distinct cortical zone around the cen- tral corpuscle, which has been derived from the medullary zone of the centrosome of the first polar spindle. This stage is identical with the first one described, except that the rim of the old centrosome is still present and the central corpuscle is only about one-half as large. The sixth stage (Fig. 13) shows the rim of the old centro- some still present, but in smaller pieces which do not stain as deeply as in the previous stage. The cortical zone has enlarged and become fainter. The centrosome is composed of a medullary zone and a central corpuscle. Summary. The central corpuscle of the first polar spindle becomes the centrosome of the second polar spindle with a medullary zone and a central corpuscle. The medullary zone of the centro-. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
