坐骨神经经过骨盆上称为坐骨大孔的开口，通常走行于梨状肌的下方，因此梨状肌的疾患或痉挛或导致与坐骨神经痛症状相似的腿痛。

The sciatic nerve travels through an opening in the pelvis called the greater sciatic foramen, and typically runs below the piriformis muscle.

youdao

结论：以牙槽孔至颧下嵴起始部的弧长和弦长为标准弯制注射针头，采用口内注射法进行上牙槽后神经阻滞麻醉，成功率为98％。

Conclusion: We use L as arch length and H as chord length to bend syringe needle that is used to posterior superior alveolar nerve block anesthesia by intraoral injection. The success rate is 98%.

youdao