当我们提起并打开胸腔时，我们实际上要提起胸骨柄(胸骨上面的骨头)向上，同时剑胸骨(胸骨的底端)向肚脐的方向下沉。

Whenever we lift or open the chest, we actually want to lift the manubrium (bone above the sternum) upward while we lower the xiphoid process (bone below the sternum) downward toward the navel.

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目的： 研究体外培养乳鼠胸骨剑突软骨细胞的原代培养方法，探讨该方法应用的可行性和应用价值。

Objective: To investigate the method of the primary culture chondrocyte from newborn mouse breastbone , and discuss the feasibility of this method and it's application value.

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