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In the present study, the developmental changes in the mandibular condyle of mammalian <I>Suncus murinus</I>, ranging from 5 days to 30 days after birth, were investigated histologically and histometorically.<BR>Histologically, at 5 days after birth, the mandibular condyle showed layers of articular surface, proliferation, differentiation, and hypertrophy, and an erosion line and cancellous bone. At 10 days, all layers in the condyle were similar. At 15 days, the thickness and the number of cartilage cells in the layer of cartilage (layer of differentiation+layer of hypertrophy) had decreased. At 20 days, the layer of cartilage had decreased markedly, in both thickness and number of cartilage cells. The erosion line was located higher. At 25 days, the layer of cartilage showed conspicuously a decrease in thickness and in number of cartilage cells. The erosion line was in a higher position, and the cancellous bone had increased. At 30 days, the layers of proliferation and differentiation had disappeared. The layer of cartilage was almost entirely occupied by the layer of hypertrophy, and this layer extended sporadically and irregularly into the areas between the cancellous bones. The erosion line had almost disappeared, and the cancellous bone spaces had decreased markedly.<BR>Histometorically, the thickness in the layers of articular surface and proliferation decreased greatly from 5 days to 10 days, but it decreased gradually from 10 days to 25 days. The thickness in the layer of cartilage reduced gradually from 5 days to 15 days, but it decreased conspicuously from 15 days to 25 days. It again decreased gradually from 25 days to 30 days.<BR>The result of the present study indicates that the mandibular condyle of the mammalian <I>Suncus murinus</I> shows rapid development in a short period of time after birth.
- 一般社団法人 日本顎関節学会の論文
一般社団法人 日本顎関節学会 | 論文
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