Observation of elastic fiber´s change of mouse TMJ due to several round factor, principily external stimulations, their influence on the TMJ structure´s change and the analize of the consecutive evolution of the disease is most important. So, the author believe that the factor of TMJ feature is the elastic feature´s change and it´s the principal factor of the TmJ disease. For observation of the increase and disposition of elastic fiber that to regulate the elastic feature of tissue and allow it existence. For this propose, observation with histologic methods on 20 mouse ICR of 3 days, 1 week, 2 weeks, 3 weeks and 4 weeks, the results were as follows;
1. In the early stage, the condyle of TMJ is originated from cartilage mass, and it´s calcification is endochondral.
2. In the early stage, the disc is relatively thin and immature, but in the later stage the fiber is dense and the disposition is most functional.
3. Observation of the early stage, the elastic fiber is a thin fiber that to across anteroposterior direction, but in the later stage elastic fiber are developed, the disposition that in the early stage was perpendicullar to articular surface, now is parallel.
4. The elastic fiber was observated most clearly in the retrodiscal tissue.
5. In conclusion, the elastic fiber is observed like a thin fiber 1 week from born, but the fiber to increase the weight and it dispose functionally, and 4 week from born, it can realize the normal function.
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