File:On Innervation of Antagonistic Muscles. Ninth Note.-Successive Spinal Induction (1906) (14586783230).jpg

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Identifier: philtrans06828160 (find matches)
Title: On Innervation of Antagonistic Muscles. Ninth Note.--Successive Spinal Induction
Year: 1906 (1900s)
Authors: Sherrington, C.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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e-jerks. The knee-jerks were elicited by taps of equal intensity delivered at intervalssignalled by a metronome. During the time marked by the signal the afferent nerve of aflexor muscle of the knee was weakly faradised. This inhibitory stimulus depressed theknee-jerk. After the inhibitory stimulus was discontinued the jerks increased to beyond theiramplitude prior to the inhibition ; this increase is accompanied by a tonic after-action followingeach jerk. Time registered above in seconds. In the scratch-reflex/ after its inhibition by the crossed extension-reflex,or the homonymous flexion-reflex, a similar after-exaltation is sometimesseen. Fig. 4 exemplifies such an occurrence. But the time of interruptionof the reflex has usually in my records been too short to allow much scopefor the development of successive spinal induction, and the quick tiring ofthe scratch-reflex under electric excitation is unfavourable to examining itthere. 1906.) On Innervation of Antagonistic Muscles. 485
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Fig. 4.—Scratch-reflex of spinal dog. The reflex was evoked from the skin of the shoulderby unipolar faradisation applied for a period marked by the signal line A. The reflexsoon after its commencement was inhibited by stimulating (unipolar faradisation) theskin of the planta of the foot engaged in the scratching-reflex. The time of theinhibitory stimulus is registered by signal line B. After cessation of the inhibitorystimulus the scratch-reflex—its stimulus being continued throughout—returned, andon return was more ample than before the inhibition. Time registered above infifths of second. 486 Prof. C. S. Sherrington. (Jan. 31, It is easy to evoke reflex-extension of the hind limb by stimulation of theskin of the opposite hind limb. With the spinal dog laid on its side (e.g., left)and a thread attaching the knee of the slightly flexed right limb to a recordinglever, the delivery of a certain stimulus (e.g., 15 break-shock at 30 persecond) by unipolar faradisation through a gil

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  • bookid:philtrans06828160
  • bookyear:1906
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Sherrington__C_
  • booksubject:Proceedings_of_the_Royal_Society_of_London
  • booksubject:Philosophical_Transactions_of_the_Royal_Society
  • bookpublisher:Royal_Society_of_London
  • bookcontributor:
  • booksponsor:
  • bookleafnumber:7
  • bookcollection:philosophicaltransactions
  • bookcollection:additional_collections
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29 July 2014
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