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。
At the distal part of femur in fetus age of 30 weeks, a cluster of lump-like osteogenic cell, osteoblast and basophlous osteoid filled among cells appeared at the secondary ossification center.
胎龄30周的股骨远端，骨化中心呈现团块状成群的骨原细胞和成骨细胞，嗜碱性的类骨质填充于细胞间；
Results:The metaphysis and the periphery of the secondary center of ossification were red marrow. They showed marked enhancement on T 1WI. Enhancement ratio declined in both regions with age.
结果：干骺端骨髓和骨骺二次骨化中心周边骨髓为含有丰富血管的红骨髓，增强后呈显著强化，且干骺端增强率较骨骺骨髓更高，但随年龄增长，两者的增强率均逐渐减低。
Results:The metaphysis and the periphery of the secondary center of ossification were red marrow. They showed marked enhancement on T 1WI. Enhancement ratio declined in both regions with age.
结果：干骺端骨髓和骨骺二次骨化中心周边骨髓为含有丰富血管的红骨髓，增强后呈显著强化，且干骺端增强率较骨骺骨髓更高，但随年龄增长，两者的增强率均逐渐减低。
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