. Modern surgery, general and operative. rs,which are supplied by theanterior thoracic nerve. Theskin over the lower part ofthe muscle is usually Nerve.—Division of this nerve producesparalysis of the biceps and ofthe brachialis anticus muscles(paralysis of the forearm flex-ors). This palsy becomesespecially evident when theforearm is supinated, becausein this position the supinatorlongus can no longer act as aflexor of the elbow. There isanesthesia of the radial side ofthe forearm anteriorly andposteriorly. The Musctdospiral or RadialNerve.—Division of this nervehi
. Modern surgery, general and operative. rs,which are supplied by theanterior thoracic nerve. Theskin over the lower part ofthe muscle is usually Nerve.—Division of this nerve producesparalysis of the biceps and ofthe brachialis anticus muscles(paralysis of the forearm flex-ors). This palsy becomesespecially evident when theforearm is supinated, becausein this position the supinatorlongus can no longer act as aflexor of the elbow. There isanesthesia of the radial side ofthe forearm anteriorly andposteriorly. The Musctdospiral or RadialNerve.—Division of this nervehigh up near the plexus causesparalysis of the extensor mus-^cles of the elbow and the wrist,of the supinators, and of thelong extensors of the thumband fingers. When dividednear the middle of the humerus,the triceps usually, but notinvariably, escapes. If theinjury is below the branchgoing to the supinator longus,that muscle will escape; other-wise it will become extensor palsy causes wrist-drop and loss of the power of. Anterior surface. Posterior surface. Fig. 545.—Distribution of the cutaneous nervesto the shoulder, arm, and hand. The region of theN. radialis is represented by the unbroken hatchedline, that of the N. ulnaris bj the broken hatched , Anterior, h, posterior surface; >?f, Nn. suprascapular(plexus cervicalis); ax, chief branch of N. a.\illar.;c/»vf,cpi, Nn. cutanei post. sup. and inf. ();ra, terrftinal branches of X. radialis; cm, cl, medius (also to the plexus) and lateralis(chiefly to the X^. medianus); cp, X. cutan. palmar.,X. rad.; cmd, X. cutan. medialis; mc, X^. medianus;u, X. ulnaris; cpit, X*. cutan. palm, ulnaris (Henle). extending the first phalangesof the fingers and thumb; and, as Gowers has pointed out, flexion i^ reducedto one-third of the normal, the flexors having lost power from the loss ofantergic support. As a rule, in musculospiral palsy there is loss of is sometime
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