File:General physiology of muscles and nerves (1881) (14797534013).jpg

Identifier: generalphysiolo00rose (find matches)
Title: General physiology of muscles and nerves
Year: 1881 (1880s)
Authors: Rosenthal, I. (Isidor), 1836-1915
Subjects: Physiology Muscles Nerves
Publisher: New York, D. Appleton and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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o certainother influences, becomes dulland opaque, but which in a freshcondition is usually somewhattransparent. The form of theganglion-cells is very variable.Sometimes they appear almostglobular; in other cases theyare elliptic ; others, again, areirregular, provided with numer-ous offshoots. Most ganglion-cells have one or more project-ing processes; some are, indeed,found without processes, but itis certain that this condition ismerely artificially produced, theprocesses having been torn offduring the preparation of theganglion - cell. Ganglion - cellsare occasionally inserted in thecourse of the nerve-fibres, sothat the processes differ in noway from other nerve-fibres, asis shown in fig. 27. In the gan-glion-cells of the dorsal marrow, which have many processes.Fig. 2/. Gaxglion-celi.s ^ j- wiTH NERVE-PROCESSES, somc of thcsc appear exactly like the rest of the cell body— that is to say, they are finely granulated; these are called protoplasmic processes. On the other hand, in
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NERVE-FIBRES AND NERVE-CELLS. 107 almost every cell a process may be distinguished whichis altogether distinct in appearance from the rest. Theprotoplasmic processes become gradually finer and sepa-rate into more parts, and the processes of neighbom-ingcells are partly connected together. But the one pro-cess which is distinguishable from the rest passes alongfor a certain distance as a cylindrical cord, and then,suddenly becoming thicker, it encases itself in a me-dullary sheath, and in appearance entirely resemblesthe medullary fibres of the peripheric system. It isextremely probable, although it is hard to prove it withcertainty, that a fibre of this sort passing out of thedorsal marrow is directly transformed into a periphericnerve-fibre, while the protoplasmic processes continu-incr on their course within the central orpan serve toconnect the ganglion-cells. The nerve-system, the main parts of which we havethus roughly examined, effects the motions and sensa-tions of the body. Th

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