大鼠脊髓向后柱核投射的纤维行径的研究

后柱核由薄束核、楔束核和外楔核组成。用菜豆白细胞凝集素（ＰＨＡ－Ｌ）倾行追踪技术研究大鼠脊髓向后柱核的纤维投射。结果显示，颈膨大注入例的标记纤维见于后索背侧部的外侧区（腹侧部行径皮质脊髓束），标记末梢分布于楔束核和外楔核；胸髓注入例的标记纤维见于后索背侧部的中间区，标记末梢分布于楔束核内侧部和薄束核外侧部；腰膨大注入例的标记纤维见于后索背侧部的内侧区，标记末梢分布于薄束核大部；骶髓注入例的标记纤维见于后索背侧部的最内区，标记末梢分布于薄束核的最内侧部。实验结果表明，大鼠脊髓向后柱核的投射行径存在明确的定位分布。

The Course of the Projecting Fiber from the Spinal Cord to the Dorsal Column Nuclei in Rat

he dorsal column nuclei consist of gracile, cuneate and external cuneate nuclei. The fiber projections from the spinal cord to the dorsal column nuclei were studied with anterograde transported phaseolus vulgaris leucoagglutinin (PHA-L ) in rat. In case of injections into the cervical enlargement the labeled fibers were seen in the lateral region of the dorsal part of the dorsal column (corticospinal tract in the ventral.part of the dorsal column) and labeled terminations were distributed in the cuneate and the external cuneate nuclei. In case of injections into the thoracic cord the labeled fibers could be found in the median region and labeledterminations in the medial part of cuneate nucleus and lateral part of gracile nudeus. In case of injections into the lumbar enlargement the labeled fibers were in the medial region and labeled terminations in most of the gracile nucleus. In case of injections into the sacral cord the labeled fibers were in the most medial region and labeled terminations in the most medial part of gracile nucleus. Experimental results showed that the fiber projections from the spinal cord to the dorsal column nuclei have distinct topographical distributions.