骨代謝様式からみた側頭骨含気腔の形成過程

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  • Bone metabolism in the process of pneumatization of the temporal bone.

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In our histological study using pig and human temporal bones, two bone metabolic systems, membranous ossification system and chondral ossification system, were observed in the process of pneumatization and growth of the mastoid process. In chondral ossification points, middle ear inflammatory stimulus did not suppress the bone metabolism. But in membranous ossification points, it suppressed the bone metabolism and it caused the suppression of pneumatization and the suppression of growth of the mastoid process. In pigs, the chondral ossification ceased until the late phase of pregnancy and only the membranous ossification was observed after birth. So the experimental studies of the suppression of pneumatization and the suppression of the mastoid process were clearly observed in pigs. But in human temporal bone, after birth, the chondral ossification was still observed in two points. It is suggested that the suppresion of the pneumatization is not so clear compared to the pig temporal bone. But in the membranous ossification points of human temporal bone, the suppression of pneumatization will be caused by the middle ear inflammatory stimulus.

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