Modern surgery, general and operative . re-arm flexors). This palsybecomes especially evidentwhen the forearm is supin-ated, because in this positionthe supinator longus can nolonger act as a flexor of theelbow. There is anesthesiaof the radial side of the fore-arm anteriorly and poste-riorly. The Musculospiral or Ra-dial Nerve.—Division of thisnervQ high up near the plexuscauses paralysis of the exten-sor muscles of the elbow andthe wrist, of the supinators,and of the long extensors ofthe thumb and fingers. Whendivided near the middle ofthe humerus, the tricepsusually, but not invariably,esca
Modern surgery, general and operative . re-arm flexors). This palsybecomes especially evidentwhen the forearm is supin-ated, because in this positionthe supinator longus can nolonger act as a flexor of theelbow. There is anesthesiaof the radial side of the fore-arm anteriorly and poste-riorly. The Musculospiral or Ra-dial Nerve.—Division of thisnervQ high up near the plexuscauses paralysis of the exten-sor muscles of the elbow andthe wrist, of the supinators,and of the long extensors ofthe thumb and fingers. Whendivided near the middle ofthe humerus, the tricepsusually, but not invariably,escapes. If the injury isbelow the branch going tothe supinator longus, thatmuscle wiU escape; otherwise it wall become paralyzed. The extensor palsycauses wrist-drop and loss of the power of extending the. first phalangesof the fingers and thimib; and, as Gow^ers has pointed out, flexion is re-duced to one-third of the normal, the flexors ha\dng lost power from theloss of antergic support. As a rule, in musculospiral palsy there is loss. Anterior surface. Posterior surface. Fig. 483 .^Distribution of the cutaneous nerves to theshoulder, arm, and hand. The region of the N. radiahs krepresented by the unbroken hatched hue, that of the by the broken hatched lines, a, Anterior, h, posteriorsurface; sc, Nn. suprascapular (plexus cervicahs); ax, chiefbranch of N. axiUar.; cps, cpi, Nn. cutanei post. sup. andinf. (from N. radiahs); ra, terminal branches of N. radialis;cm, cl, Nn. cutanei medius (also to the plexus) and laterahs(chiefly to the N. medianus); cp, N. cutan. pahnar., N. rad.;cmd, N. cutan. mediaUs; me, N. medianus; u, N. ukiaris; epu,N. cutan. palm, vdnaris (Henle). The Symptoms After Division of Nerves 753 of supination. Sensibility is sometimes greatly affected, and sometimesvery slightly. If the injury is above the level of the musculospiral groovethere will be anesthesia in the area supplied by the sensory fibers of the nerve(Fig. 483). If the nerve is injure
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectsurgery
