犬大腿骨頭における分裂線の関節軟骨と骨質表面との関係について

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It is a familiar fact that the splitting-lines-method has been taken up as a simple means to learn the fibrous arrangements of tissues and organs. But the significance of the splitting lines has not necessarily been concluded by the uniform notion yet. However, since Professor Nakayama emphasized the significance of the irregular splitting lines in his presentation titled "The Significance of the Splitting Lines, especially that of the Irregular Splitting Lines" disclosed in the Journal of the Kyushu Dental Society in 1957, and publicized his view that the irregular splitting lines are the direct functional manifestation of the bone substance shown as its defence reaction, it has been proved by many senior students of his class that his conclusion holds good with regards to the various cartilages. Based on this theory, the author studied on the differences reflected by the age-change of the splitting lines between the articular head and the articular cartilage, both of which being related with the same function as the articular movement. Observations were made on the head of femur and articular cartilage of the dog, using 32 pure Beagle dogs ranging from 60 days pre-natal to 1 month, 2 months, 4 months, 6 months, 8 months, 11 months, 1 year, 2 years, 4 years and 6 years post-natal. Described below is the result of this observation : 1. By the observation of the splitting lines of the articular head and cartilage, following classifications were made : 1) Pre-incipient growth stage (60 days pre-natal) 2) Incipient growth stage (1 month post-natal) 3) Rapid growth stage (2 months to 6 months post-natal) 4) Pre-maturation stage (8 months post-natal) 5) Maturation stage (11 months to 4 years post-natal) 6) Atrophy stage (6 years post-natal) 2. Age-change of the splitting lines on the surface of bone substance of the articular head was found to indicate inverse condition to that of the articular cartilage which covers the surface of bone. It is deduced from this face that the difference is due to that the articular cartilage is of the elastic tissue to perform the cushioning function against the impact made by the articular movement, while the articular head is of the solid tissue to perform the supporting function of the body weight during the articular movement. That is considered to be caused by the time lags between the articular cartilage which is rich in the splitting line-systems does not take much time to eliminate the effect of the external stimulus by such physiological phenomenon as the articular movement and the articular head which is of weak elasticity can not eliminate the external stimulus quickly.
1977-01-31

著者

鳥谷潤
九州歯科大学解剖学教室

犬大腿骨頭における分裂線の関節軟骨と骨質表面との関係について

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