A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . himself revolving in space,but objects may appear to revolve from right to left,or from left to right. Vertigo of an up or downcharacter appears more rarely and has been thoughtto obtain in timiors in the anterior vermis whichbeing close to the corpora quadrigemina press upon 728 RKFEREXCE HANDBOOK OF THE MEDICAL SCIENCES Cerebellum, Disorders of these stnictiires. The character of the vertigo must beshar[)ly enquired into. The symptom arises chieflyfrom lesions co
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . himself revolving in space,but objects may appear to revolve from right to left,or from left to right. Vertigo of an up or downcharacter appears more rarely and has been thoughtto obtain in timiors in the anterior vermis whichbeing close to the corpora quadrigemina press upon 728 RKFEREXCE HANDBOOK OF THE MEDICAL SCIENCES Cerebellum, Disorders of these stnictiires. The character of the vertigo must beshar[)ly enquired into. The symptom arises chieflyfrom lesions connected witli tlie vestibular paths, asthe labyrinth is the chief ceplialic ganglion iii theproprioceptive systems, of which the cerebellumconstitutes the coordinating center, and disease of thelabyrinth itself, as well as of its extraccrebellar andintracerehellar jiatlis may cause vertigo. Differen-tial diagnosLs between labyrinthine disease and Intra-cerebellar disorder is possible as a rule by means of theBarany tests. Stewart and Holmes point out that accumulation ofexperience shows that as a general rule objects rotate. Fio. 12S9.—Patient with Skew Deviation of the Eyes. Theright eye looks up and out: the left eye down and in. Patientwith a tumor of the lateral lobe of the cerebellum. (Holmes.) from the diseased to the well side in intra- as well asin extracerebellar disturbances, whereas the subjectivesense of rotation is usually from the diseased to thewell side in intracerebellar disorder, and the reversein extracerebellar involvement of the paths. Furtherstudy is needed on this point. Cerebellar hypotonus, usually one-sided, may bepresent in cerebellar affections. It is revealed bypalpation of the muscles, testing of resistance move-ments, and looseness in performance of passive move-ments. This hv-potonia or atonia is usually accom-panied by normal or even exaggerated tendon reflexes,as contrasted with that of peripheral neuritis ortabes. It is present only in more
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