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NERVE VIBRATIONS.
In the Medical Press and Circular of the 25th July 1888, I
have already spoken about the different ways of causing nerve
vibrations, and perhaps I may be allowed to quote what I then
said :
—" The manipulator causes the nerve to vibrate either by
frictions made transversely over it, in a manner similar to that
in which a harp-player passes his fingers over the strings of his
harp ; or he makes vibrations over the nerve. When the latter
method is adopted, he either follows its course with the tips of
his fingers in a centripetal direction, or he keeps them fixed, and
vibrates upon such parts of it as are more painful.
" The different methods of procedure (frictions or vibrations)
depend upon the position and surroundings of the nerve.
ITervus medianu.s is very suitable for demonstration of the
first. The arm is abducted until it reaches the horizontal
position. The nerve coming out of the axilla ^an be easily
felt as a thick cord lying to the outside of the br^^chial artery.
When the tips of the fingers are quickly drawn over it trans-
versely in the manner indicated above, a feeling is produced
similar to that felt on electric stimulation. ISTervus supraorbitalis,
which lies on the bone, is a good instance where the second kind
of procedure may be employed.
" It is essential that the tissues which lie between the fingers
and the nerve should move with the former as one ; otherwise
the friction does not reach its destination, and the manipulation
becomes useless.
"According to my own experience, the effects of this
mechanical method are, so far as I can judge
—
" 1. Raising of the nervous energy.
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