Nervous and mental diseases . modify theamount of electricity requisite to secure a given response. Probablyidentical conditions cannot be secured twice in succession. All amperemeasurement comparisons are therefore relative and approximate. Cellsvary so much in activity at different times that to base the record uponthe number used is futile. Where a rheostat is employed in controllinga lighting current of a given potential, an index scale can be arrangedthat will furnish fairly satisfactory records. 42 NERVOUS AND MENTAL DISEASES. A uniform method of making electric tests is important. The a
Nervous and mental diseases . modify theamount of electricity requisite to secure a given response. Probablyidentical conditions cannot be secured twice in succession. All amperemeasurement comparisons are therefore relative and approximate. Cellsvary so much in activity at different times that to base the record uponthe number used is futile. Where a rheostat is employed in controllinga lighting current of a given potential, an index scale can be arrangedthat will furnish fairly satisfactory records. 42 NERVOUS AND MENTAL DISEASES. A uniform method of making electric tests is important. The ar-rangement of electrodes recommended bv Erb and found satisfactory in M. frontalis Upper branch offacialM. M. orbic. palpebr. Muscles of the f nose \ M. zygomatici M. orbicul. oris <,(Middle branch offacial M. masseter M. levator menti M. quadr. menti M. triang. menti X. hypogloss. Loicer branch of facial M. platysma myoides Muscles of the J root of tongue \ M. omohyoideus iV. thoracic, anter.(M. pector.). N. phrenicus Suprascapular Plexus point. (Erbs point. brachialisM. deltoid., biceps,brachial, intern, andsupinat. long.) Fig. 8.—Nerves and motor points in face and neck. Region of centralconvolutions Region of thethird frontalconvolution M. temporalis Upper branch offacial in frontof ear N. facialis N. auriculo. branch of facialLower br. of facialM. splenius M. sternocleido- mastoideusN. accessorius M. levator anguli scapulaeM. cucullaris N. dors, scapulce N. axillaris N. thoracic, long.(M. serratusantic, maj.) all instances is perhaps the best. The large or indifferent electrodethoroughly moistened in warm water, with which it is also well to wetthe skin, is applied over the sternum, where the absence of muscles andof much sensitiveness obviates disturbing features. The small or activeelectrode, fitted with an interrupter and well moistened, is then placedover the nerve or muscles to be examined, and the current allowed topass (that is mad
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