Abstract
The effect of chronic middle ear inflammation on the pneumatization of the tympanic bulla was investigated in pigs. The pig tympanic bulla has an air cell system that is divided by trabeculae, and closely resembles the human mastoid air cell system. The tympanic bulla and its air cell system in normal ears were well developed because of the bone formation and the bone resorption inside the cortex. On the other hand, the tympanic bulla affected by chronic otitis media in young pigs exhibited reduced pneumatization arising from impaired bone resorption, and the later otitis media developed, the more the air cell system was preserved. It was concluded that the occurrence of chronic middle ear inflammation in the early stages of life causes inhibition of pneumatization by hindering the development of the air cell system, and the degree of the inhibition was related to the time of the onset of the disease.
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