Diseases of the nervous system : a text-book of neurology and psychiatry . eous nerves. The oculopupillarysigns are evident. Superior Brachial Plexus Palsy.—Here the upper branches, fifth andsixth cervical, are involved. Duchenne described the earlier casesminutely. The palsied muscles have been mentioned. The sensory PLEXUS PALSIES 289 disturbances are more extensive than those observed in the inferiortype. The pupillary symptoms are absent. Mixed Types.—These are more frequent. The more common formof so-called Erbs palsies belong here. Many of these are bilateral,the two arms, however, being
Diseases of the nervous system : a text-book of neurology and psychiatry . eous nerves. The oculopupillarysigns are evident. Superior Brachial Plexus Palsy.—Here the upper branches, fifth andsixth cervical, are involved. Duchenne described the earlier casesminutely. The palsied muscles have been mentioned. The sensory PLEXUS PALSIES 289 disturbances are more extensive than those observed in the inferiortype. The pupillary symptoms are absent. Mixed Types.—These are more frequent. The more common formof so-called Erbs palsies belong here. Many of these are bilateral,the two arms, however, being dissimilarly involved. The study of themuscles involved in the atrophy, the electrical changes, the sensorychanges, to light, touch, heat, cold, pain, bony sensibility, and toposition, the presence of trophic disturbances (protopathic systemchanges), and the oculopupillary phenomena determine the rootsinvolved. (See Figs. 11 to 16.) There are a number of bony conditions which can determine brachialplexus palsies. Tuberculous, syphilitic, carcinomatous, sarcomatous,. Cvn C VI. vn Figs. 141 and 142.—Topography of tactile, pain, and thermal sensory disturbances ina superior brachial palsy type due to injury to the shoulder. The fifth, sixth, andseventh cervical roots are involved. (Dejerine.) arthritic infiltrations about the vertebral canal impinging upon thecords of the plexus can give rise to palsies of this type. Similarchanges not infrequently also cause pictures which are often confusedwith brachial neuritis. Some of the severe arm pains with mild atro-phies are forms of brachial radiculitis (q. v.), either inflammatory or trau-matic in origin. In the course of a rheumatoid arthritis one notinfrequently encounters these radicular disturbances which areundoubtedly referable to a vertebral arthritis. Course.—General statements regarding the course are misleading. The majority of Erbs palsies due to obstetrical accidents recover, especially when only a few roots of the
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