Nervous and mental diseases . part of the deltoid, and all attempts fail atlateral extension of the arm from the Ixuly. The loss of the teresminor action is insignificant. Owing to the deltoid atrophythe acromion is uncovered and theshoulder rendered pointed andangular. The head of the hum-erus can readily be felt from thelateral aspect. In some instancesit drops from its socket,leaving adeep furrow under the nutrition of the joint alsosuffers and arthritis is likely todevelop, limiting the range ofjoint motion. When the arm ispassively moved, the scapula doesnot follow it unless
Nervous and mental diseases . part of the deltoid, and all attempts fail atlateral extension of the arm from the Ixuly. The loss of the teresminor action is insignificant. Owing to the deltoid atrophythe acromion is uncovered and theshoulder rendered pointed andangular. The head of the hum-erus can readily be felt from thelateral aspect. In some instancesit drops from its socket,leaving adeep furrow under the nutrition of the joint alsosuffers and arthritis is likely todevelop, limiting the range ofjoint motion. When the arm ispassively moved, the scapula doesnot follow it unless joint diseaseis also present. An initial arth-ritis, by involving the articularbranches, may spread to the cir-cumflex and disable the deltoid. Anesthesia in the distribution field of the circumflex over the lowertwo-thirds of the deltoid is usually present. The musculospiral nerve is the most frequently injured nerve in thearm, perhaps in the body. Arising from the posterior brachial cord, and1 Br. Med. Jour., Oct. 9, Fig. 103.—Atrophy of the deltoid and deformityof the shoulder in paralysis of the circumflexnerve. 298 DISEASES OF SPINAL MENINGES AND SPINAL NERVES. arising originally from the fifth, sixth, seventh, and eighth cervical nervesor in some cases from the sixth, seventli, and eighth cervical and the firstdorsal, it winds around the humerus in the musculospiral groove underthe triceps, where it is subject to muscular compression and externalviolence or pressure. It supplies all the extensors of the elbow, wrist,and fingers, both the supinators, and through its radial branch the skinon the dorsal surface of the thumb and two radial fingers, and the pos-terior radial border of the hand. It also furnishes articular filaments tothe wrist and carpal joints. By cutaneous branches given oif above thoseto the triceps it supplies the skin in an area extending from the wrist ina narrow but widening strip up the dorsum of the forearm, and over theouter aspect of the ar
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Keywords: ., bookcentury1900, booksubjectmentalillness, booksubjectnervoussys
