Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


The motor symptoms predominate, the muscles affected being the extensors
of the wrist and fingers, and the supinators. There is a characteristic
"drop-wrist"; the wrist is flexed and pronated, and the patient is
unable to dorsiflex the wrist or fingers (Fig. 90). If the hand and
proximal phalanges are supported, the second and third phalanges may be
partly extended by the interossei and lumbricals. There is also
considerable impairment of power in the muscles which antagonise those
that are paralysed, so that the grasp of the hand is feeble, and the
patient almost loses the use of it; in some cases this would appear to
be due to the median nerve having been injured at the same time.

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