. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 600 quently uncertain or quite impossible. In no other epididymes among my material are such large and wide cells found. In brief, while amitotic division is the rule in all ciliated cells examined, nowhere else could the complete process, i. e. including cytoplasmic separation, be followed; nor indeed is direct nuclear division anywhere so stri- kingly evident, except in the rat and lobster. Figures 1 to 7 represent a continuous portion of the wall, every cell, with one exception (fig. 5), being at some stage of amitosis. Th
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 600 quently uncertain or quite impossible. In no other epididymes among my material are such large and wide cells found. In brief, while amitotic division is the rule in all ciliated cells examined, nowhere else could the complete process, i. e. including cytoplasmic separation, be followed; nor indeed is direct nuclear division anywhere so stri- kingly evident, except in the rat and lobster. Figures 1 to 7 represent a continuous portion of the wall, every cell, with one exception (fig. 5), being at some stage of amitosis. The first cell is in the final phase. The deeply basic-staining daughter nuclei are still joined along a small area, but beyond this point on either side a new mem- brane has already appeared. Figure 2 represents an early stage in direct division. This nucleus is vesicular. The initial constriction has begun on the lower border, closer to one pole, and progresses obli- quely. The path of the ensuing fission is usually marked by a deli- cate more chromatic line or thread. Figure 3 again represents a final I. Figs. 8 to 12. Selected cells from an adjacent section of an efferent duct. In 8 the nucleus is large and vesicular; the plane of division extends from below to the left. In 9 division is complete; this is a more common type; the cleft passes in such a manner as to divide the spherical or oval mother nucleus into two curved sausage -shaped daughter nuclei, rotated in opposite directions so as to fit together more or less closely \vith curved surfaces apposed (see also fig. 43). In 10 the huge vesicular oval nucleus is undergoing horizontal fission. In 11 the nuclear division is complete; but the daughter nuclei, one of which is vesicular the other very cliro- niatic, have not yet moved apart. In 12 the division has proceeded farther, and cell membranes, with inter-cellular spaces showing beyond the point of nuclear separation, have appeared. stage. Here, however, in contrast t
Size: 2602px × 961px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherjenag, bookyear1913
