The cell in development and inheritance . icular structure. It is further certain that in some cases at leastthe spermatid-centrosome passes into, or gives rise to, a part of themiddle-piece, and that from it the axial filament grows out into thetail. The remaining structures arise, as a rule, from the cytoplasm,and both the acrosome and the envelope of the axial filament oftenshow a direct relation to the remains of the achromatic figure ( ar- 1 The terminology, now almost universally adopted, is due to La Valette St. George. 118. ??^ See Fig. 119. 162 THE GERM-CELLS choplasm or kinop
The cell in development and inheritance . icular structure. It is further certain that in some cases at leastthe spermatid-centrosome passes into, or gives rise to, a part of themiddle-piece, and that from it the axial filament grows out into thetail. The remaining structures arise, as a rule, from the cytoplasm,and both the acrosome and the envelope of the axial filament oftenshow a direct relation to the remains of the achromatic figure ( ar- 1 The terminology, now almost universally adopted, is due to La Valette St. George. 118. ??^ See Fig. 119. 162 THE GERM-CELLS choplasm or kinoplasm) which is found in the spermatid in theform of a sphere (sometimes an attraction-sphere) or Nebenkern or both. Apart from the nuclear history, these facts have beendefinitely determined in only a few cases, and much confusion stillexists in the accounts of different observers. Thus a number ofinvestigators { Platner, Field, Benda, Julin, Prenant, Niessing)have asserted that the centrosome passes into the acrosome, instead of.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
