目的：使用生长棒技术（GR）对未成熟猪进行手术，评价牵张压力下椎体的生长情况。
Objective. The aim of this study is to evaluate the vertebral body growth under distraction forces in immature pigs treated with growing rod (GR) technique.
对于人类而言，视网膜由密集的光感棒体以及视椎体细胞组成。 棒体细胞在弱光条件下比椎体细胞更容易发挥作用，并且这些细胞也是在鲨鱼视网膜内发现的最常见的细胞类型。
Rods are able to function in much lower light than cones - and these were the most common cell types found in all of the sharks.
在脊髓后方髓外硬膜下可见多个强化的结节，主要见于C2及L4-S1椎体平面。
There are several intradural extramedullary enhancing nodules posterior to the spinal cord seen best at the level of C2 and at L4-S1.
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