. The cell; outlines of general anatomy and physiology. re connected with the nuclear membrane by linin threads, whichstretch out in every direction. Whilst the nucleolus splits upinto separate spherules, two centrosomes, surrounded by a smallradiation sphere (Fig. 125 II.), make their appearance near toone another in the protoplasm, close to the outer surface of thenuclear membrane (Fig. 125 II). The segments then become 236 THE CELL shorter and thicker (Fig. 125 II., III.). The centrosoraes separ-ate from one another, until finally they are situated at oppo-site sides of, and at some distanc
. The cell; outlines of general anatomy and physiology. re connected with the nuclear membrane by linin threads, whichstretch out in every direction. Whilst the nucleolus splits upinto separate spherules, two centrosomes, surrounded by a smallradiation sphere (Fig. 125 II.), make their appearance near toone another in the protoplasm, close to the outer surface of thenuclear membrane (Fig. 125 II). The segments then become 236 THE CELL shorter and thicker (Fig. 125 II., III.). The centrosoraes separ-ate from one another, until finally they are situated at oppo-site sides of, and at some distance from, the vesicular this time, the rest of the nucleolus has disappeared; thenuclear membrane becomes dissolved, and the two bundles, eachcontaining four nuclear segments, arrange themselves in theequator between the centrosomes; then each bundle splits upinto two daughter-bundles containing two nuclear segments,which separate and move towards the poles (Figs. 125 IV.,126 J.). The sperm-mother-cell now becomes constricted into I. II.
Size: 1302px × 1920px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidcelloutlines, bookyear1895
