各種ほ乳動物がく関節円板の微細構造に関する研究

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I carried out scanning electron microscope observations, of the rabbit, mongolian gerbil, dog, cat, and Japanese monkey joint discs, all having different occlusion organs respectively, in order to elucidate the functional significance of the temporomandibular joint disc. I investigated the three dimensional fiber architecture of the discs and obtained the following results.1. The superior and inferior articular surfaces of all joint discs were covered with membranous structures organized from fine collagen fibrils of 0.1-0.2 μ in diameter.2. Fold-like structures were observed in the superior and inferior articular surfaces of all the joint discs.3. The fold-like structures reflected the fiber architecture inside the joint discs.4. Differences in the fold-like structures were observed in the comparative study of the various animal species.5. The fiber architecture of the matrix in the central portion of each joint disc was made up of fiber bundles running in an anteroposterior direction, but in the case of the dog and cat, these fiber bundles were of a wavy configuration.6. The fiber architecture of the matrix in the mediolateral peripheral margins of each of the joint discs was mainly made up of fiber bundles running parallel to the peripheral margins. No clear differences could be established among the various animal species.7. The fiber architecture of the anteroposterior peripheral matrix in all the joint discs was in common fiber bundles which ran parallel to the peripheral margins, interweaving with fi ber bundles running in an antero-posterior direction. However, the anterior peripheral matrix in the case of the cat was different.8. Chondrocytes were noticed in the rabbit and mongolian gerbil, but the locations were different.9. The joint disc of the monkey differed from the others by having an architecture that was resistant to multi-directional stress and to deformation.