File:General physiology of muscles and nerves (1881) (14775361124).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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abundantly in the central or-gans. They generally have many processes (four, six andeven up to twenty), which branch and unite togetherlike network. Many cells exhibit one process, difier-ing from the others, which passes into a nerve-fibre(nerve-process: cf. fig. 68,, la and 3c). These nerve-processes pass out from the central organ and formthe peripheric nerves. Within the central organ theprocesses of the ganglion-cells form a very involvednetwork of fibres ; between these there are, however,other fibres which completely resemble the periphericnerve-fibres. There is no reason for ascribing to thesefibres of the central organ qualities other than those ofthe peripheric fibres. When in the central organ phe-nomena are observed which never occur in the peri- 266 PHYSIOLOGY OF MUSCLES AND NERVES. pheric nerve-tibres, it is natural to refer these to thepresence of the ganglion-cells. As a matter of fact, all organs which contain nerve-cells, the central organs as well as the peripheric
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Fig. 68. Ganglion-cells from the human brain. 1. A eaiigUon-cell, of which one process,, a, becomes the axis-cjlinder of a nerve-fibre, 6. 2. Two cells, a and b, interconnected. 3. Diagrammatic representa-tion of three connected cells, each of -which passes into a nerve-fibre, c. 4.Ganglion-cell partly filled ^^•ith black pigment. organs, in which they are present, though not so abun-dantly, exhibit certain peculiarities, which we must re-gard as caused by the nerve-cells, /.nd as we are in nocase able to examine the nerve-cell by itself, but mustalways examine it in connection with, and mingled withthe nerve-fibres, we can but carefully determine the dif- CAPACITIES OF NERVE-CELLS. 267 ference in the behaviour of these organs from that ofordinary nerve-fibres, and then regard all not appertain-ing to the nerve-fibres as peculiar to the nerve-cells. We know that the nerve-cells are irritable, thatthej transmit the excitement which arises in them, andtransfer it at the terminal orofa

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