. Electro-physiology . power, which at first lie in rows, corres- ponding with the fibrils of which they are the disintegration product. With advancing dissolution the axial bundle flows away in a viscid mass, along with the firmer substance of the ; The fibrils appear less capable of resistance than the axoplasm. " Shortly after death nothing remains of the fibrils ; in their place there is a knotty string, which has often been ; (Schieffer- decker's words, thus quoted, are confirmed by the observations of Biedermann.) It is far more difficult to discover the
. Electro-physiology . power, which at first lie in rows, corres- ponding with the fibrils of which they are the disintegration product. With advancing dissolution the axial bundle flows away in a viscid mass, along with the firmer substance of the ; The fibrils appear less capable of resistance than the axoplasm. " Shortly after death nothing remains of the fibrils ; in their place there is a knotty string, which has often been ; (Schieffer- decker's words, thus quoted, are confirmed by the observations of Biedermann.) It is far more difficult to discover the structure of the axis- cylinder in the nerve-fibres of the higher vertebrates, which are surrounded with a thick medullary sheath ; and this no doubt accounts for the current divergences of opinion. We should a priori assume that the structural relations of the axis-cylinder would coincide in all essential points throughout the animal kingdom. When the existence of a fibrillated structure has been determined in one case, it may almost be postulated that fibrils are everywhere the proper constituents of the cylinder-axis. And this presumption of Eemak and Max Schultze has in fact been confirmed by the remarks of Engelmann, Kupffer, Maley, Boveri, Kolliker, Jacobi, Joseph, and others — neither v. Fleischl's theory, that the axis-cylinder is a column of fluid, nor that of Kuhnt, that the axial space is filled with " a soft, somewhat elastic, homogeneous mass, finely or coarsely granulated," and that the fibrillar longitudinal strife are folds of the supposed " axis- cylinder sheath," having any foundation. As in the non-medullated fibres of Petromyzon and certain invertebrates (crayfish), so in medullated fibres, the axis-cylinder is composed of a soft ground-substance rich in water, and of
Size: 2648px × 1887px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
