. Medical and surgical therapy. (fig. 6). The position is thenone of a slight degree offlexion and pronation ofthe wrist, which also in-clines to the ulnar fingers are flexed onthe metacarpal bones;flexion of the phalanges is marked, especially theflexion of the second phalanx on the first, whichoccurs in all the fingers from the index to the littlefinger, and becomes more marked in each. The thumb, besides beingslightly fiexed, shows pro-nounced opposition. So that in the normal statethe tone of the flexor and pro-nator muscles is superior tothat of the extensors. The musculo - spira
. Medical and surgical therapy. (fig. 6). The position is thenone of a slight degree offlexion and pronation ofthe wrist, which also in-clines to the ulnar fingers are flexed onthe metacarpal bones;flexion of the phalanges is marked, especially theflexion of the second phalanx on the first, whichoccurs in all the fingers from the index to the littlefinger, and becomes more marked in each. The thumb, besides beingslightly fiexed, shows pro-nounced opposition. So that in the normal statethe tone of the flexor and pro-nator muscles is superior tothat of the extensors. The musculo - spiral is thenerve of extension. In theupper arm it supplies thetriceps (long, external, and in-ternal heads) and the anconeus ;in the forearm, the extensorsof wrist and fingers (fig. 8). In musculo-spiral paralysis,therefore, there is immediateand very marked drop of thehand and fingers.^ The wrist and the first phalanges ^ Even at the time of injury it is quite common to see eudden con-traction of the flexors of the fingers Fig. 7.—Attitude of handin musculo - spiral para-lysis (wrist-drop). 28 CLINICAL FORMS OF NERVE LESIONS are flexed; the flexion is limp, without any con-tracture, and it is easily reducible (fig. 7). MUSCLES. NERVES. BOOTS. Stemo-cleido mast. Spinal accessory. (XI.)&C,C».Trapezius. ,, ., C*, C*. Deltoid. Circumflex. C», C«. Pectoralis major. Ext. anterior thoracic. C, C, C. Infraspinatus. Suprascapular. C». C. Teres minor. Circumjlex. C». Teres major. Nerre to teres major. C^ C, C. Pectoralis minor. Int. anterior thoracic. C, C*. D. Latissimus dorsi. Long subscapular. C*, C, C. Biceps. Musculo-cutaneous. C, anticus. ,, ,, C, C. Triceps. Musculo-spiral. C*, C. Supinator longus. ,, ,, C, €•. Ext. car. rad. long. ,, ,, C, C. Anconeus. ,, ,, C^C*. Ext. car. ulnaris. ,, ,, C, C». rad. brev. ,, •,. C, C. Ext. coram, dig. ., ,, C», C, C». Abd. long, pojlicis. ., ,, C, C. Ext. brev. pollicis. ,, ,, C«, C. Fig. 8.—Muscles
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