Nervous and mental diseases . Fig. 104.—Characteristic position of hand in musculospiral palsy. longed stupor of drunkenness, surgical anesthesia, or narcotism. Directblows to the arm may also produce musculospiral palsy, and cold is oftenaccredited as a cause. The motor symptoms of disease of the musculospiral nerve are exten-sive, interesting, and characteristic. The elbow and wrist can not beextended, and the long extensors of all the digits and the supinatorsof the hand are inactive after a lesion near the armpit. When thenerve is affected in the musculospiral groove, the usual location, t
Nervous and mental diseases . Fig. 104.—Characteristic position of hand in musculospiral palsy. longed stupor of drunkenness, surgical anesthesia, or narcotism. Directblows to the arm may also produce musculospiral palsy, and cold is oftenaccredited as a cause. The motor symptoms of disease of the musculospiral nerve are exten-sive, interesting, and characteristic. The elbow and wrist can not beextended, and the long extensors of all the digits and the supinatorsof the hand are inactive after a lesion near the armpit. When thenerve is affected in the musculospiral groove, the usual location, thebranches to the triceps escape and elbow extension is preserved. Inlesions at or below the lower third of the humerus the branch to the LESIOXS OF SPECIAL SPIXAL NERVES. 299. Fig. 105. -Dropped \showio-i rist from luusculospiral palsy,retrocarpal tumor. supinator longus escapes, as it does in systemic affections. The wrist cannot be extended and wrist drop is produced. The fingers are semiflexedand can only be extended by the action of the interossei—which are sup-pHed by the ulnar—after the first phalanges are passively extended on themetacarpals. The thumb lacks extension movements, and those of thefingers progressively diminish from the index to the little finger. Fre-quently on the back of the carpusthere develops a synovial tumordue to the overcarpal flexion, theinadequate support of the extensortendons, and perhaps, in part, tothe implication of the articularbranches of the nerve. This con-stitutes a dense, painless elevationthat exaggerates the wrist-dropdeformity. Unbalanced by theextensor paralysis the flexors areweakened so tliat the hand-graspis reduced in strength more thanhalf. The muscular wastingshows most on the dorsal sur-face of the f
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Keywords: ., bookcentury1900, booksubjectmentalillness, booksubjectnervoussys
