Nervous and mental diseases . Fig. 110.—Brachial plexus injury. Area of anesthesia below black line. Injuries to the brachial plexus usually involve more than one nerve1 Jour. A. M. A., Jan. 12, 1907. 2 Br. Med. Jour., Oct. 17, 1903. 298 DISEASES OF SPINAL MENINGES AND SPINAL NERVES. in the arm. Nerve injury arising from dislocations of the humerusand from strains on the arm usually implicate several nerves. Thus themedian, ulnar, and musculospiral may be injured together, or a singlenerve may surfer. In figure 110 is shown a case suffering from awrench of the arm received in alighting from a
Nervous and mental diseases . Fig. 110.—Brachial plexus injury. Area of anesthesia below black line. Injuries to the brachial plexus usually involve more than one nerve1 Jour. A. M. A., Jan. 12, 1907. 2 Br. Med. Jour., Oct. 17, 1903. 298 DISEASES OF SPINAL MENINGES AND SPINAL NERVES. in the arm. Nerve injury arising from dislocations of the humerusand from strains on the arm usually implicate several nerves. Thus themedian, ulnar, and musculospiral may be injured together, or a singlenerve may surfer. In figure 110 is shown a case suffering from awrench of the arm received in alighting from a moving ulnar, internal cutaneous, nerve of Wrisberg, and intercosto-humeral were simultaneously injured. The anesthetic area could bedistinctly marked out. A similar combination of nerve-lesions occursin birth-palsies from pulling on the arm or using a hook over the neck orin the axilla. Figure 111 shows the deformity in such a case : in a breechpresentation attempts were made to draw the arm down from the si
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