腰4、5间盘纤维环结构形态的细微观察

An Observation on the Micro-structure and form of Annulus Fibrosus of Lumbar Interverbral Disc 4,5

观测成人腰椎间盘纤维环纤维层水平的细微解剖结构。用显微外科技术将腰间盘纤维环分离，每层纤维均分为8个观测点，测量纤维走向与水平面的夹角等数值。结果表明：各测点处的纤维走向角α，在水平面，沿径向由外向内，随层数的增加不断变大，最小纤维走向角发生在前正中处，其值为25°～30°；在同一层，纤维走向角由前向后不断变大，在椎间盘正后方为70°～90°，即此部分纤维走向与后纵韧带走向基本一致；用归一化方程，归一化直线可以非常方便地求出任一层、任一点处的纤维走向角α；腰椎间盘纤维环的前方、左右两侧皆有交织现象发生，左右两侧交织区域多些，仅后方正中附近未发现相临两层的交织现象。由此可见，腰椎间盘纤维环纤维具有特殊的细微结构，与其功能相适应。

We observed the structure and form of adult annulus fibrosus of lumbar intervertebral disc at the fibrous layer level. The annulus fibrosus of lumbar interverbral disc was delaminated by using microsurgical technique. 8 testing points were taken in each layer and the angles between their fibers going and horizontal plane were measured. The results showed that the fiber going angle at each measurement point continually increased with the increase of fibrous layer from outside to inside along the radial direction in horizontal plane. The least fiber going angle was 25°-30°. The fiber going angle at the same layer gradually increased from front to back. The fiber going angle was 70°-90° at the middle of the back of annulus fibrosus of lumbar interverbral disc. The fiber going was consistent with the posterior longitudinal ligament going. Through the normalized equation and normalized line, the fiber going angle at any point in any layer could be obtained conveniently. We also observed that the annuli fibrosus were interlaced in the front, left and right of annulus fibrosus of lumbar intervertebral disc. And there were more interlaced areas in local sides of lumbar intervertebral disc, but there was no interlaced areas between layers near the middle of posterior annulus fibrosus. So we came to the conclusion：Annulus fibrosus of lumbar intervertebral disc has a special micro-structure in adaptation with its function.