There are two prominent muscle in on either side of the face, white, with small black spots, bead point of steel needle of a root beard.

脸的两边有两块突出的肌肉，白白的，上面有一粒粒小黑点，点上有一根根钢针般的胡须。

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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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