SUMMARY -The suprascapular nerve originates from the upper trunk of the brachial plexus or less frequently from the root of C5. It runs a short way and crosses the suprascapular notch. It innervates the supraspinatus muscle and the acromioclavicular and glenohumeral joints. Then, it crosses the lateral edge of the spine of the scapula passing through the spinoglenoid notch, and innervates the infraspinatus muscle. These are potential sites of injury to the suprascapular nerve. Three cases of suprascapular nerve entrapment causing an isolated infraspinatus muscle atrophy in volleyball players were studied. It is suggested the hypothesis that the nature of the smash, in which the athlete uses the arm violently, more than does in volleyball service or in the art of reception, is the key to the pathogenesis of the lesion in volleyball players.KEY WORDS: volleyball, infraspinatus muscle, suprascapular nerve, entrapment neuropathy, muscular atrophy.Atrofía isolada e não dolorosa (?) do músculo infraespinhoso: jogadores de voleibol destros versus canhotos RESUMO -O nervo supraescapular se origina do tronco superior do plexo braquial ou, menos freqüentemente, da raiz de C5. Percorre curto caminho e cruza a incisura supraescapular. Daí, o nervo supraescapular dá ramos para o músculo supraespinhoso e para as articulações acromioclavicular e glenoumeral. Então, cruza a borda lateral da espinha da escápula, passando através da chanfradura espinoglenóide e inervando o músculo infraespinhoso. Esses são locais potenciais para lesão do nervo supraescapular. Foram estudados três casos de compressão do nervo supraescapular causando atrofia isolada do músculo infraespinhoso em jogadores de voleibol. É sugerida a hipótese de que a natureza do ataque, na qual o atleta usa o braço violentamente, mais do que no saque ou na recepção, seja a chave da patogênese da lesão em jogadores de voleibol. PALAVRAS-CHAVE: voleibol, músculo infraespinhal, nervo supraescapular, neuropatía compressiva, atrofia muscular.Injuries to the suprascapular nerve have been considered rather rare, even in athletes 3 . In 1963 Kopell and Thompson (quoted by Liveson et al. 7 ) first described entrapment of the suprascapular nerve at the suprascapular notch. In 1981, according to Liveson et al. 7 , Ganzhorn et al. described the first case of suprascapular nerve entrapment at the spinoglenoid notch 7 . This sort of lesion has been observed in baseball pitchers 2 , racket players and in volleyball players 3 * 9 .We present three cases of isolated atrophy of the infraspinatus muscle of the dominant shoulder, one of them occurring in a left handed volleyball player. The pathogenesis of this nerve entrapment syndrome is discussed.
In this study it is shown the incidence of brain diseases in Campina Grande PB, Brazil taking account hospitalizations under prospective payments. Neurologic affections were classified according to ICD-9. It is demonstrated that 3.09% of hospitalizations are due to brain diseases, mainly cerebrovascular disorders. It is evident that Campina Grande is included in Brazil's north-east average of brain diseases representation, and this result contrasts with nation-wide results because of regional differences. Mental disturbances were not included in this study because of the difficulty in obtaining data; they were classified in the other diseases group.
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