. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 367 According to Fritsch (who is again contradicted by Iwanzotf), " it is possible, in speciall}7 favourable parts of the cross-sections of a plate, to discover fine threads of nerve at right angles to the direction of the plates, entering at the granular layer and dis- appearing between the ; Beyond these again, in the palisade border, they are plainly visible, and form the direct boundary of the palisade (Fig. 236). Their proper ending seems to be at the dorsal border of this layer, in " soft protoplasmic b
. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 367 According to Fritsch (who is again contradicted by Iwanzotf), " it is possible, in speciall}7 favourable parts of the cross-sections of a plate, to discover fine threads of nerve at right angles to the direction of the plates, entering at the granular layer and dis- appearing between the ; Beyond these again, in the palisade border, they are plainly visible, and form the direct boundary of the palisade (Fig. 236). Their proper ending seems to be at the dorsal border of this layer, in " soft protoplasmic bodies, which in the preparation cohere in spherical (berry-like) ; Beyond the border of the palisade comes the dorsal (" muscular," Fritsch ; " metasarcoblastic," Babuchin) part of the plate (Eanvier's couche intermddiaire). This layer, which is. Fio. 236.— Torpedo ocdlata. of electrical plate with dependent nerve. ? = dorsal border, or layer, of connective tissue; m = stratnm moleoihu-c ; p = palisade-border with nerve-endings; (G. Fritsch.) developed by the transformation of embryonic muscle-substance, exhibits nothing further of the characteristic structure of striated fibres. Krause, indeed, describes " striated, bowed fibres " as a residue of muscle-fibrils, but other observers have not detected them. According to Fritsch, this layer, like the stratum granulosum, " is composed of minute particles, set in rows parallel with the axis of the prisms, and little more refractile than the intermediate substance" (Fig. 236, m}. Fritsch inclines to regard the regular structure (as observed by him) as a confirmation of clu Bois-Eeymond's molecular theory, though he does not go so far as to affirm that the rows of particles are actually " the required electromotive ; Iwanzoff, on the contrary, views them merely as a kind of honey- comb or foam-like structure of the plasma of which the "inter- mediate
Size: 2493px × 1002px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
