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This analysis has been made from a study of 228 dissections in 114 human cadavers, of which 62 were black and 52 white, 106 male and 8 female. Since there was such a marked discrepancy relative to sex and since the incidence of vertebral and nerve plexus variations were approximately equal in the two sexes, a single set of statistics has been tabulated. The greater frequency of the anteriorly placed lumbosacral plexus in white subjects and of the posterior type in negroes noted by Bardeen in 246 subjects, of whom 172 were negroes, was not corroborated in our study.

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Recaus:c of dil-ergiiig opinioiis and conflicting data on the ctio1og:o f imlated p r a l y s i s of the serratus anterior (maguus) muscle, n htiidy of the origin, structural variations, and relations of the long thoracic nerve was undertalien. A search of the literature revealed oiily the coiitributioris of Struthers ( 'Oil aiid Dargeni ( ' 3 5 ) , based on twenty-five dissections and a study of twenty spwiiiieiis, respectiaely. The data and con-c~lusions of the present iiivcstigation a r e derived from a n analysis of 100 dissections in fifty human caclarera. Many of the structural coiiclitioiis considered as abnormal and anomal o w by Slr.ntlierk a i d Daygent a r e interpreted in the prescnt and larger beries as falliiig within normal variational range. C'OXIFOSITION O F TR E LOScl THORACIC NERVEThe inain trimli of the iicrve was formed in 84% of the cases hy the -riiiioii o f brandies from the anterior divisions of the fifth, sixth a i d s e r~n t l i cervical nerves. In 8 % , the branch from the s e r m t h nerve was lacking, aiid in another-87,, the nerve W R R formed from brandies of the fifth, sixth, seventh and eighth nerves. Tlie branches forming the long thoracic nerve were noted to arise obliquely from above, downward 37s T H E A N 4 T < l M I C 4 L RECCIRll TO!, 71, N O 4 4U(.Lk.T 1938

No abstract