. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 405 rises integrally from the spinal medulla, and subsequently bifurcates, by repeated branching, into as many branches and rarni as there are nerves in the electrical organ, as are contained within its plates and chambers. The total diameter of the entire nerve, characterised in the fresh state by its peculiar silvery colour, is in no way due to extraordinary size of the original primitive fibre, but much more to the vigorous development of the connective- tissue sheaths, with which the nerve is invested down to its finest ter
. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 405 rises integrally from the spinal medulla, and subsequently bifurcates, by repeated branching, into as many branches and rarni as there are nerves in the electrical organ, as are contained within its plates and chambers. The total diameter of the entire nerve, characterised in the fresh state by its peculiar silvery colour, is in no way due to extraordinary size of the original primitive fibre, but much more to the vigorous development of the connective- tissue sheaths, with which the nerve is invested down to its finest terminal ramifications. The disposition of these sheaths is best. FIG. 264.—Portion of from electrical nerve-fibre of Mainptcrtints. (Fritsch.) understood from transverse sections, such as Fig. 264, after Fritsch, from the nerve-trunk. In the centre is the round section of the axis-cylinder, O'OOS mm. in diameter, surrounded with a medullated sheath from about 0'03 to 0'012 mm. in breadth. Externally to this there is first a broad zone of reticulated connective tissue, regarded by Fritsch as the analogue of the Henle-Schwaiin sheath (the " inner sheath " of Bilharz). This occupies ^ of the total diameter of the trunk, which is about 1/1 mm., and may, with the nerve-fibre, easily be shelled out from the next, concentric layers of connective tissue, which are richly vasculated. Seeing that at every division of a nerve-fibre the total cross-section of. 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
Size: 1602px × 1559px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
