. Electro-physiology. Electrophysiology. 368 ELECTRO-PHYSIOLOGY CHAP. To summarise the main points relating to structure, and more particularly to innervation, of the organ of Torpedo, this much is certain. Each ganglion-cell of the electric lobe in the brain gives off an axis-cylinder process (analogous to Deiter's process in the ganglion - cells of the spinal cord), which continues as an un- branched constituent of the electric nerve, down to one of the columns that compose the organ. Here the medullated fibre 'suddenly breaks up into a number (12—20) of small ramifications (Wagner's brush),
. Electro-physiology. Electrophysiology. 368 ELECTRO-PHYSIOLOGY CHAP. To summarise the main points relating to structure, and more particularly to innervation, of the organ of Torpedo, this much is certain. Each ganglion-cell of the electric lobe in the brain gives off an axis-cylinder process (analogous to Deiter's process in the ganglion - cells of the spinal cord), which continues as an un- branched constituent of the electric nerve, down to one of the columns that compose the organ. Here the medullated fibre 'suddenly breaks up into a number (12—20) of small ramifications (Wagner's brush), which are arranged regularly, one over the other, and each partially supply a plate. On entering the mucous tissue that fills up the space between every pair of plates, each. Fn;. 'J3~.—Hijiiiiirjtus <'lci.'ti'ii'ii*. terminal fibre divides many times dichotomously, and finally ends, after losing its medullated sheath, at the ventral surface of the plate, in a manner analogous with the terminal ramification of the axis-cylinder in the motor end-plates of striated muscle-fibres. The nature of the true ending and whether it is free, or, as Fritsch says, lies within the palisade layer, is still undecided, and awaits further investigation. The uniformity of structure and internal relations in the electrical organ is of great moment to the theory of the discharge of these fishes. In <_li/nniotus, as in Torpedo, the organs exhibit a bilateral symmetry, and are so powerfully developed that the fish might be said to consist principally of electric organs. Fig. 237 is a good representation of the form of the fish. Notwith-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
