鼓室の含気化〔Pneuinatisation〕,特に顔面神経管との関係について

抄録

In development of middle ear, the pneumatization of the mastoid cellulae is well known.
While the pneumatization of the tympanum is rarely discussed, tympanum itself has to pneum- atize.
The author studied the relationship between the pneumatization of the temporal bone and thal of the tympanum, in vertical parallel section to pyramis in 50 cars of 50 cases.
Dimensions of the tympanum was measured by the planimeter, and compared with the rate of the radiographical pneumatization of the temporal bone.
Furthermore, the author observed the influence of the pneumatization of the tympanum to the facial canal wall.
The results are as follows:
1) High correlation between dimensions of the tympanum and pneumatization of the temporal bone was seen.
Namely, the better the pneumatization of the temporal bones, the wider their dimensions, howe- ver the degree of repression, did not show more narpowing.
2) The development of tympanal cellulae had a high correlation with the radiographical appearance of the temporal bone.
3) Themore developed the tympanum, the thinner was the facial canal wall.
This consequence is due to the absorbtion of bony tissue in pneumatization mechanism.
In 24 cases out of 41, the facial canal wall defect was recognized in the portion of sinus tympani.
From the result of(3), the cause of the facial paresis in tympanoplastic procedure was discussed.
The author notes that when the tympanoplasty is employed in caseof a well developed pneumatization of the temporal bone extreme care must be taken.