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NERVE VIBRATIONS. 75
for the head of the humerus in the axilla, and ascertain the exact
situation of the neck of the bone. The fingers are held as shown
in fig. 38, and the frictions are made from above downwards, the
same precautions as regards intervening tissues being taken here
as elsewhere.
Nervus Medianus.
How this nerve is found I have already described (page 53).
We can easily follow it in its whole course in the upper arm; but
in trying to reach it below the bend of the elbow, we must flex the
Fig. 42.
arm somewhat, as the strong fascia in front of the elbow prevents
us from coming down on it.
It lies to the inner side of the biceps muscle, being separated
from it by the artery. The tips of the fingers are placed just
inside the tendon, and the friction made from without inwards.
Nervus Musculo-Spiralis.
The place to find this nerve is where it emerges from under
the outer head of the triceps muscle and in its course down
between the brachialis anticus and the supinator longus (fig. 43).
It is necessary first to abduct the arm, and then to somewhat
flex the forearm towards the upper, because otherwise we are
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