. A text-book of medicine for students and practitioners . ey do not, however,possess any decided {etiological significance. The true tic is generally a dis-ease which arises on the basis of a general neuropathic constitution. Almostall cases which I have seen occurred in nervous persons who were easily excitedmentally, and came from nervous families. Tics of the muscles of the throatand neck belong to the same group of psychomotor neuroses as the true DIFFERENT FORMS OF LOCALIZED SPASM 255 facial tic—that is, a condition in whicli morbid, unconscious, and forced cen-tral (cortical) motor stim
. A text-book of medicine for students and practitioners . ey do not, however,possess any decided {etiological significance. The true tic is generally a dis-ease which arises on the basis of a general neuropathic constitution. Almostall cases which I have seen occurred in nervous persons who were easily excitedmentally, and came from nervous families. Tics of the muscles of the throatand neck belong to the same group of psychomotor neuroses as the true DIFFERENT FORMS OF LOCALIZED SPASM 255 facial tic—that is, a condition in whicli morbid, unconscious, and forced cen-tral (cortical) motor stimuli keep the affceted muscles in a continuous stateof tonic-clonic spasm. This disease is closely associated with myoclonia andcertain hysterical convulsive spasms. The nomenclature is not as essentialas a correct conception (as fai- as possible at the present time) of the natureof this group of diseases. Although the spasms (ride Figs. 140 and 141) are rarely strictly limitedto a definite group of muscles or the distribution of a single nerve, we can,. Fig. 140.—Severe case of spasm of the accessory nerv^e (trapezius and sterno-niastoid muscles). (From the Erlangen Medical Clinic.) nevertheless, as a rule, indicate certain nuiscles as being chielly allected. Mostfrequently the muscles innervated by the spinal accessory nerve (sterno-cleido-mastoid and ti-apezius) ai-e aUected. We s))eak of this as a spinal accessoryspasm. Through the contraction of the steiMioniasioiil, the lu^ad is turned 256 DISEASES OF THE NERVOUS SYSTEM
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