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Experiment has shown that the Eustachian tubes have three angles each of 45 degrees, viz.: 1. Upward from the horizontal pharyngeal plane. 2. Outward right and left from a vertical antero-posterior medium pharyngeal plane. 3. Backward from a medium transverse pharyngeal plane.
It is evident that if these angular measurements are correct for the average Eustachian tubes, the catheters for them must conform to these angles. Again, the access through the mouth behind the soft palate is freer and easier than through the narrow nares with sensitive cavernous erectile tissues on the turbinated bones and with a vomer, all which often are irregularly formed, placed and twisted, hindering facile movements to the catheters, Eustachian.
Again, if the aurists are rhinologists, the mirror will allow "them" (him or her) to see the catheter enter or entered into the Eustachian tube, so that its penetration is proved by sight. With these contrivances
CUTTER E. ORAL RIGHT AND LEFT EUSTACHIAN CATHETERS AND TENT HOLDERS. JAMA. 1897;XXIX(19):972–973. doi:10.1001/jama.1897.02440450038009
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