[Illustration: Fig. 8--Radial paralysis.]

Symptoms.--Immediately subsequent to injuries which involve the radial
nerve, there is manifested more or less impairment of function.
Remembering the structures supplied by the radial nerve and its
branches, one can readily understand that there should occur as
Cadiot[11] has stated:

In complete paralysis, the joints of the affected limb with the
exception of the shoulder are usually flexed when the horse is
resting. In consequence of loss of power in the triceps and
anterior brachial muscles, the arm is extended and straightened on
the shoulder, the scapulohumeral angle is open, and the elbow
depressed. The forearm is flexed on the arm by the contraction of
the coracoradialis (biceps brachii), while the metacarpus and
phalanges are bent by the action of the posterior antibrachial
muscles. The knee is carried in advance, level with, or in front
of, a vertical line dropped from the point of the shoulder. The
hoof is usually rested on the toe, but when advanced beyond the
above mentioned vertical line, it may be placed flat on the ground,
the joints then being less markedly bent. When the limb as a whole
is flexed, it may be brought into normal position by thrusting back
the knee with sufficient force to counteract the action of the
flexor muscles.

[Illustration: Fig. 9--Merillat's method of fixing carpus in radial
paralysis. Courtesy, Alex. Eger.]

When made to walk, the animal being unable to exert muscular action with
the paralyzed structures, limply carries the member as a whole, and