中耳Pneumatisationと耳管との発育上の相対的関係についての実験的研究
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概要
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Previous study on the pneumatic room of the temporal bone brought the hypothetical conclusion that relativity between the components of the duct and sinus were so close that more the duct was reduced the larger was the sinus growth. It is the purpose of this study to try to confirm the hypothesis in the case of the middle ear.Mastoid of the 22 pigs were eliminated for the purpose of Keeping a condition of experimentally controlled pneumatisations-suppression. The changes in the developmental process of the eustachian tube were observed and measured microscopically. The following results were obtained.1) The cross section of the eustachian tube in the side of eliminated mastoid became larger dur ing one and half mouth after operation, and the mucous epithelium and subepithelial connective tissue were also hypertrophic to motivate the functioning.2) Diameter of the eustachian tube and the air quantity in the mastoid cells was keptin inverse.3) Regeneration of bone begins 3 weeks after the increase of mastoid-regeneration. During the process the upper mucous epithelium was regenerated. These regenerations were recognized as a similar process as in the physiological growth of human body.