columna posterior medullae spinalis

例句：

1. 1.The patient's condition is critical, and we need to perform emergency surgery on the columna posterior medullae spinalis.
   病人的状况危急，我们需要对后柱髓进行紧急手术。
2. 2. The anatomy of the columna posterior medullae spinalis is complex, requiring a detailed study.
   后柱髓的解剖学复杂，需要详细研究。
3. 3. During the operation, the surgeon carefully dissected the columna posterior medullae spinalis to expose the affected area.
   在手术中，外科医生小心地剥离了后柱髓以暴露受影响的区域。