说明胎儿股骨远端次级骨化中心初始时其内存在软骨管，软骨管对次级骨化中心的形成起作用。
It was concluded that the cartilage canals of fetus play great roles in formation of secondary ossification center and exist in primary secondary ossification center.
为观察软骨骺内次级骨化中心与软骨管的关系，及次级骨化中心初始形态结构。
To observe the correlativity between secondary ossification center and cartilage canals in cartilage epiphysis and the initial morphosis of the secondary ossification center.
为观察软骨骺内次级骨化中心与软骨管的关系，及次级骨化中心初始形态结构。
To observe the correlativity between secondary ossification center and cartilage canals in cartilage epiphysis and the initial morphosis of the secondary ossification center.
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