. Nursing in diseases of the eye, ear, nose, and throat . h inthe scala vestibuli, and these waves pass over to the scala tympanithrough the helicotrema at the apex of the cochlea and end against,the membrane covering the round window. By these waves themembrana basilaris is thrown into motion, and the motion of themembrane is greatest at a certain point that corresponds to the sizeof the wave. The vibration at this point is recorded by the hair-cells of the organ of Corti and the impulse carried away to the brainby the nerve that receives it at this point, and the impulse is per-ceived as sou
. Nursing in diseases of the eye, ear, nose, and throat . h inthe scala vestibuli, and these waves pass over to the scala tympanithrough the helicotrema at the apex of the cochlea and end against,the membrane covering the round window. By these waves themembrana basilaris is thrown into motion, and the motion of themembrane is greatest at a certain point that corresponds to the sizeof the wave. The vibration at this point is recorded by the hair-cells of the organ of Corti and the impulse carried away to the brainby the nerve that receives it at this point, and the impulse is per-ceived as sound and the memory of it stored in some centerin the brain that receives it. The above theory, although not ap-proved by all authorities, is the one that has been most generallyaccepted up to the present time. CHAPTER XIX EXAMINATION OF THE EAR: GENERAL METHOD ANDINSTRUMENTS COMMONLY EMPLOYED When the first aural examination is made, the canal,in a large number of cases, may be obstructed by ceru-men, epithelial plugs, or some foreign material introduced. Fig. 40.—Syringing an ear. by the patient to relieve pain. This obstruction mustnecessarily be removed before the drum-membranecan be seen, and the removal may best be accomplished 186 EXAMINATION OF THE EAR 187 with least discomfort to the patient by means of a Pomeroysyringe and a warm 10 per cent, solution of bicarbonate ofsoda. In case the obstruction is from an impacted massof cerumen, inspissated pus, or epithelium, the plug shouldbe loosened and disintegrated by filling the canal withwarm hydrogen peroxid for a few minutes before theinjection (Fig. 40). In using the Pomeroy syringe the auricle should beheld between the index and middle fingers of the left
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectotorhin, bookyear1922
