Medical and surgical therapy . spiral nerve, in the upper arm. that the fibres which sup])ly the tworadial extensors of tlic wiist arc situated, whilst tlie hl)rcs intendedfor the extensors of tlie fingers occupy the postcro - internalportion : in the external portion the fibres of sui)ination appearto lie. NORMAL AND PATHOLOGICAL PHYSIOLOGY OF THE MUSCLESSUPPLIED BY THE MUSCULO-SPIRAL NERVE. In considering the physiology of mnsrles the im-mortal Morks of Duchenne (of Boulogne) will be re-ferred to. Duchenne, by local application of electri-city to muscles, and by observation of cases of pro-g
Medical and surgical therapy . spiral nerve, in the upper arm. that the fibres which sup])ly the tworadial extensors of tlic wiist arc situated, whilst tlie hl)rcs intendedfor the extensors of tlie fingers occupy the postcro - internalportion : in the external portion the fibres of sui)ination appearto lie. NORMAL AND PATHOLOGICAL PHYSIOLOGY OF THE MUSCLESSUPPLIED BY THE MUSCULO-SPIRAL NERVE. In considering the physiology of mnsrles the im-mortal Morks of Duchenne (of Boulogne) will be re-ferred to. Duchenne, by local application of electri-city to muscles, and by observation of cases of pro-gressive atrophy in children and adults, has estab-lished the normal and pathological physiology ofmuscles. His statements have been confirmed innearly every case. THE MUSCtfLO-SPIRAL NERVE 27 Before describing the appearance of the hand inparalysis of the different nerves of the upper extremity,it is necessary to realise what is the natural position of the sound hand when ^^F?ff?fl^^^»?^^:.?^?!?..?.•.?i:^?.?. ii^^S Fig. 6. -Position of normal handin repose. at rest, the muscles beingas nearly as possiblecompletely relaxed andthe forearm resting on ahorizontal level (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 flexed, 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 dr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsurgery, bookyear1918
