File:Nervous and mental diseases (1919) (14594878527).jpg

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English:

Identifier: nervousmentaldis00chu (find matches)
Title: Nervous and mental diseases
Year: 1919 (1910s)
Authors: Church, Archibald, b. 1861 Peterson, Frederick, 1859-1938, joint author
Subjects: Nervous system Mental illness
Publisher: Philadelphia, London, W.B. Saunders company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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rrent,causes all the muscles to which it is distributed to contract more or I ELECTRICAL CONDITIONS. d3 less vigorously in proportion to the intensity of the current employed.It is to be particularly noted that upon allowing the current to passthe response is instantaneous, and that the muscular contraction atonce reaches its maximum and maintains it until the current is modi-fied. This phenomenon attends stimulation by either the positive ornegative faradic pole or electrode, but the negative causes a shghtlystronger effect. If, now, the constant current be substituted, we notice, first of all, that M. triceps (caput longum) M. triceps (caputintern.) Nerv. ulnaris M. flexor carpi ulnaris M. flex, digitor. cora-mun. profund. M. flex, digitor. sublim. (digiti II et III) M. flex, digit, subl.(digit, indicis etminimi) Nerv. ulnaris M. palmaris brev. M. abductor digiti min. M. flexor digit, min. M. opponens digit. min. M. lumbricales ^ V Nerv. medianus M. supinator longusM. pronator teres
Text Appearing After Image:
M. deltoideus — Nerv. musciilocutaneusM. biceps brachiiM. brach. internus M. flex, carpi radialisM. flexor digitor. sublim. M. flex, pollicis longusNerv. medianus M. abductor poUic. brev.M. opponens pollicis M. flex. poll. brev. M. adductor poUic. brev. Fig. 9.—Nerves and motor points in upper extremity. mild currents applied to the nerve-trunk produce no response. Whenthe current is suflficiently increased it causes, only at the make and 44 NERVOUS AND MENTAL DISEASES. break, single instantaneous contractions of the innervated muscles, whichas quickly subside. Looking closer, we notice that the contraction withthe negative make—otherwise the cathodal closing contraction (C.C.C.)—^is the first to appear as the current is gradually increased, that nextcomes the positive make, or anodal closing contraction (A. C. C), followedin turn by the positive break, or anodal opening contraction (A. O. C),and then, finally, by the negative break, or cathodal opening contrac-tion (C. O. C).

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Author

Church, Archibald, b. 1861;

Peterson, Frederick, 1859-1938, joint author
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30 July 2014



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