Once the needle is safely positioned, there is a second injection into the nerve root where it exits the foramen, a side opening where two vertebrae meet.

当穿刺针安全插到位后，在神经根离开椎间孔的部位，即两个椎体相连接处侧面的开口处进行二次注射。 。

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Objective: to provide anatomic basis of the vertebral artery foramen for protecting vertebral artery during the lower cervical vertebrae operation.

目的：为下颈椎前路手术预防椎动脉损伤提供解剖学数据。

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