General physiology; an outline of the science of life (1899) (14780671744)

Identifier: generalphysiolo00verw (find matches)

Title: General physiology; an outline of the science of life

Year: 1899 (1890s)

Authors: Verworn, Max, 1863-1921 Lee, Frederic S. (Frederic Schiller), 1859-1939, ed. and tr

Subjects: Physiology

Publisher: London, Macmillan and co., limited New York, The Macmillan company

Contributing Library: Columbia University Libraries

Digitizing Sponsor: Open Knowledge Commons

Text Appearing Before Image:

aph wires is very fit-ting with respect to theprinciple of centralisationupon which the two arebased. But, as has some-times happened, such acomparison ought not to becarried too far ; for example,the nerves should not beregarded simply as conduct-ing-wires for electricity. Inreality, nerves are extensionsof ganglion-cells, and, likethese, consist of living sub-stance, i.e., they have ametabolism with which theirlife and, therefore, theirfunction are inseparablyconnected. This followsdirectly from the fact thatthe nerve invariably perishes,„,, . , like any non-nucleated pro- Fio. 281.—Nervous system of man. The nerve-trunks, Jm r which contain centrifugal and centripetal paths of toplaSmiC maSS, after beingconduction, pass from the brain and spinal cord to \ cc o j_i „ l • „ ail parts of the body, and thus unite the latter Cllt off from the gangllOn-through the central nervous system into a unified 11 . wlrl,r,V1 if, Lplrmcr<5 whole (After Ranke.) Ceii LU WIULn iu fiungs.

Text Appearing After Image:

THE MECHANISM OF LIFE 581 The manner in which the elements of the nervous system areunited with one another anatomically and functionally deservesspecial attention, since the later researches upon the finer structureof the central nervous system, which have been made possible bythe extraordinary development of the microscopic technique,especially by Golgi, Weigert, Ehrlich, and others, have led to thediscovery of very peculiar but fixed relations. The element ofthe central nervous system is the ganglion-cell, but the ganglion-cell with its characteristic differentiations. From the body of thecell there extend processes, more or less numerous according tothe function of the cell, among which two kinds may be distinguishedsharply from one another. Some form a more or less richlybranched structure, and are, therefore, appropriately termeddendrites. The older histologists termed these protoplasmicprocesses. The others are the nerve-processes. So far as we nowknow, as regards the number of

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1899

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