Diseases of the nervous system .. . diag-nosis of a peripheral facial par-alysis is clear. Next we deter-mine the exact location of thelesion in the course of the must remember what waspreviously stated of disturbancesof the secretion of sweat, oftears, of the saliva; also of thefunction of the soft palate andits very questionable depend-ence upon innervation of thefacial nerve; also of disturb-ances in the sense of taste, after which exact investigation as to the presenceor absence of any one of these symptoms will lead to the localization. The farther we advance in knowledge, the mo
Diseases of the nervous system .. . diag-nosis of a peripheral facial par-alysis is clear. Next we deter-mine the exact location of thelesion in the course of the must remember what waspreviously stated of disturbancesof the secretion of sweat, oftears, of the saliva; also of thefunction of the soft palate andits very questionable depend-ence upon innervation of thefacial nerve; also of disturb-ances in the sense of taste, after which exact investigation as to the presenceor absence of any one of these symptoms will lead to the localization. The farther we advance in knowledge, the more surely will some of ourtheories be shattered and new principles be established. Fig. 188 shows a dia-gram first constructed by Erb, which has lately been modified in accordancewith the investigations of Koster. Motor paralysis and possibly disturbances in the secretion of sweat followa lesion seated below that point at which the chorda tympani branches. Ifthe rupture of continuity is above this point but below the branch for the. Fig. 187.—Diagram of the Motor InnervationTract for the Facial Nerves and for theNerves of the Extremities. Frontal Sec-tion through the Cerebrum, the CerebralPeduncles, the Pons, the Medulla, and theSpinal Cord. (Edinger.) PARALYSIS OF THE FACIAL NERVE 671 /yhers for ^t^r/(v//>ej/ stapedius muscle, disturbances of the sense of taste and in the secretion ofsaliva are added to the other symptoms. If the lesion is above the point atwhich the stapedius nerve is given off, there is in addition a disturbance inhearing, a hyperacusis; anopinion which Koster did notshare. According to Erb it wasformerly assumed that aparalysis of the soft palatefollowed a lesion of thegeniculate ganglion; or, morecorrectly speaking, paralysisof the velum palati (whichcan rarely be determined infacial paralysis) is due to alesion in the region of thegeniculate ganglion; to-daywe are convinced that thefacial nerve bears no relationto the soft palate. On theother hand, a
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