A manual of diseases of the nervous system . gave (followed in the text) were allone nerve too high ( Proc. Roy. Soc., 1883, vol. xxxv, p. 229), but this would makethe innervation of the intrinsic muscles of the hand from the second dorsal nerve,which is certainly not the case in man. NERVES OF THE ARM. 81 besides the facts of anatomy, only the evidence furnished by rave cases ofinjuiy or disease in which the lesion and its effects are well-defined.* Few-facts of this character are, however, so conclusive as that illustrated in Fig 51, inwhich the area shaded by slanting lines was rendered ana
A manual of diseases of the nervous system . gave (followed in the text) were allone nerve too high ( Proc. Roy. Soc., 1883, vol. xxxv, p. 229), but this would makethe innervation of the intrinsic muscles of the hand from the second dorsal nerve,which is certainly not the case in man. NERVES OF THE ARM. 81 besides the facts of anatomy, only the evidence furnished by rave cases ofinjuiy or disease in which the lesion and its effects are well-defined.* Few-facts of this character are, however, so conclusive as that illustrated in Fig 51, inwhich the area shaded by slanting lines was rendered anaesthetic by the divisionof the posterior roots of the last cervical and first dorsal nerves. The generalindications are that the distribution of the sensory fibres of the nerve-roots isalong the axis of the limb and not across it. The last two pairs of nervessupply the ulnar side of the limb and the finger tips, the fifth pair the radialside and the middle roots of the brachial plexus, the middle zone of each side ofthe limb and the Fig. 51.—Area of impaired sensation after division of the posteriorbranches of the 8th C. aud 1 D. nerves, by Professor Horsley for inveterateparoxysmal neuralgia in that region. Paralysis of the nerves of the upper limb may be due to disease ofthe uerve-roots, of the plexus, or of the trunks that arise from is convenient to consider, first, the diseases of the nerve-trunks, andaftervpards those of the nerve-roots and of the plexus. From theroots themselves only one important nerve-trunk is derived: the pos-terior thoracic nerve. The others spring from the plexus. The morbid influences that affect the nerves of the arm are veryvaried. The brachial plexus passes close to the shoulder-joint, andhence dislocation often damages the nerves, sometimes one only, some-times several, and occasionally all the trunks. In fractures of thebones, the nerves adjacent may be torn, or may be compressed bythe ends of the bone, or by the callus tha
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