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在10例成人尸体上观察了马尾神经的解剖学定位。在 L_3 椎间孔水平以上,前根位于马尾的前半部,后根位于后半部;L_3 椎间孔水平以下,马尾神经呈马蹄形排列,前根位于内侧半,后根位于外侧半。另在组织学切片上计数了各神经根的束数及神经纤维,后根平均含3束,前根含1束;后根与前根神经纤维的比例为3.2∶1。
Anatomical localization of the cauda equina nerve was observed on 10 adult cadavers. Above the level of the L_3 intervertebral foramen, the anterior root is located in the first half of the horsetail and the posterior root is located in the posterior half. Under the level of the L_3 intervertebral foramen, the cauda equina is arranged in a horseshoe shape with the anterior root in the medial half and the posterior root in the lateral half. The number of nerve root bundles and nerve fibers were also counted on histological sections. The posterior root contained an average of three bundles and the anterior root contained 1 bundle. The ratio of posterior root to anterior root nerve fibers was 3.2: 1.