Nervous and mental diseases . lex, suprascapular, aud musculocuta-neous may be affected simultaneously by disease of the fifth and sixthcervical nerves, from which they arise. This is usually caused byforcibly dragging the arm downward or upward, lacerating the anteriornerve-roots 1 and may occur at birth. In this lesion sensory disturb-ance is usually absent. A new growth or injury at a point betweenthe sealeni muscles opposite the sixth cervical vertebra may affect bothspinal nerves. At this point Erb found they could be simultaneouslystimulated by electricity. The muscles involved are the d
Nervous and mental diseases . lex, suprascapular, aud musculocuta-neous may be affected simultaneously by disease of the fifth and sixthcervical nerves, from which they arise. This is usually caused byforcibly dragging the arm downward or upward, lacerating the anteriornerve-roots 1 and may occur at birth. In this lesion sensory disturb-ance is usually absent. A new growth or injury at a point betweenthe sealeni muscles opposite the sixth cervical vertebra may affect bothspinal nerves. At this point Erb found they could be simultaneouslystimulated by electricity. The muscles involved are the deltoid, spinati,biceps, and brachialis amicus, and the sensory disturbance correspondsto the cutaneous distribution of the three nerves in question. Kennedy2reports some such birth accident instances greatly benefited by surgical 1 Huet. Duval, et Guillau. Rev. Neurolog., Dec. 15. 1900. 2 Br. Med. Feb. 7, 1903. LESIONS OF SPECIAL SPINAL NERVES. 303 operation. A cicatricial condition was found at Erbs point above the pr. Fig. 109.—Radicular palsy affecting the spinati. deltoid, biceps, and brachialis amicus. clavicle and outside the sternomastoid muscle : the nerves were resectedand sutured with comparatively early restoration of motor operation tends to become definitely established. For fully reports on the anatomy of the condition with the techniqueof the operation and numerous case records. Operation is recom-mended by him during the first or second year. Tubby2 hasremedied the defective biceps by utilizing the outer portion of thetriceps, which is freed from its implantation intothe olecranon and mattressed into the bicipitalremnant. _,Jl J Fig. 110.—Brachial plexus injurr. Area of anesthesia below black line. Injuries to the brachial plexus usually involve more than one nerve1 ?• Jour. A. M. A., Jan. 12. 1907. 2 Br. Med. Oct. 1903. 304 DISEASES OF SPINAL MENINGES AND SPINAL NERVES. in the arm. Nerve injury arising fr
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