Identifier: textbookofnervou1901dana (find matches)
Title: Text-book of nervous diseases; being a compendium for the use of students and practitioners of medicine
Year: 1901 (1900s)
Authors: Dana, Charles Loomis, 1852-1935
Subjects: Nervous system
Publisher: New York, W. Wood and Company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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of the triceps, and shoulder-joint. It gives sensation to the skin of the shoulder. It is veryoften paralyzed. The commonest causes are a fall or injury, dislo-cation, and rheumatic inflammation of the joint. The arm cannotbe elevated or rotated outward. There are atrophy, anaesthesia,and sometimes pain. Paralysis of the Suprascapular Nerve.—The nerve goesto the spinati muscles, teres minor, and shoulder-joint. Disease ofthis nerve alone is rare. The supraspinatus rotates the shoulder in, the infraspinatus andteres minor rotate it out. When paralyzed, there is an impairmentof rotation and some impairment of elevation of the shoulder. Paralysis of the Musculo-Spiral Nerve (Wristdrop, LeadPalsy, Compression Paralysis).—The distribution of this nerve is 142 DISEASES OF THE NERVOUS SYSTEM. given in the table and cut. Its function is to extend and supinatethe forearm, to extend the wrist and fingers, and to adduct andabduct the fingers slightly. It extends directly only the last or un-
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Fig. 76.—Paralysis of Serratus Magnus op Left Side (Leszynsky) gual phalanges, the first and second phalanges being extended bythe ulnar nerve. Etiology.—The musculo-spiral, owing partly to its course, is themost frequently affected by paralysis of all the arm nerves. Pres-sure on the nerve during sleep, especially when the patient is intoxi- NEUROSES OF THE MOTOR SPINAL NERVES. 143 cated, crutch pressure, fractures, wounds, tumors, lead poisoning,arsenical, alcoholic, and other forms of multiple neuritis are thecauses of its disordered function. Symptoms.—The symptoms of this paralysis are wristdrop,due to an inability to extend the wrist or fingers. The first andsecond phalanges can be extended somewhat by the interossei andlumbricales, but the last phalanges cannot be extended at all. Thefirst finger is least affected. The fingers can be only slightly ab-ducted, supination is generally lessened or lost; if the lesion is highup, the triceps is involved and the power of extendi

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