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NERVE VIBRATIONS. •77
The last phalanx of the thumb is placed at the inner border of
that muscle and insinuated a little underneath it (fig. 44).
At the same time as we quickly pronate the patient’s fore-
arm, we make the friction outwards with the thumb. This goes
under the muscle and over the nerve.
Nervus Posterior Interosseus of the Musculo-
Spiralis.
We must first find the head of the radius. About an inch
lower down, and between the radius and ulna, friction or pressure
produces distinct strong pain, which is felt down to the wrist.
Nervus Ulnaris.
"We must feel for this nerve where it lies in the groove behind
the internal condyle of the humerus. The high bony edges here
Fig. 45.
somewhat prevent the application of a good friction. Therefore
I always give it just underneath, where the nerve lies quite free
(fig 45).
In this case it is also better to bend the arms slightly. The
tingling in the little and the ring fingers corresponds in this, as
in the other nerves of the arm, exactly to its distribution.
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