大鼠脊髓向中央颈核和外侧颈核的投射——PHA-L顺行追踪研究

将菜豆白细胞凝集素(PHA-L)分别注入下颈髓、胸髓、腰髓和骶髓等不同脊髓节段,顺行追踪脊髓向中央颈核和外侧颈核的投射。观察结果表明,脊髓不同节段注入PHA-L,在中央颈核和外侧颈核均可见到标记末梢;比较各节段脊髓的投射分布,未能发现明显的定位关系。一侧脊髓灰质注入,在两侧中央颈核均观察到标记末梢,但主要见于同侧;外侧颈核的标记末梢仅见于同侧。结果提示,各节段脊髓均发出纤维投射到同侧中央颈核和外侧颈核。

Spinal Projections to the Central Cervical Nucleus and the Lateral Cervical Nucleus in the Rat: PHA—L Anterograde Tract Tracing Study

Spinal projections to the central cervical nucleus and the lateral cervical nucleus were studied by using anterograde transport of PHA-L in the rat. The enlargement, thoracic, lumber enlargement and sacral segments of the spinal cord were injected. Experimental results showed that the labeled terminals were seen in the CCN and the LCN after injecting PHA-L into the various segments of the spinal cord and nodistinct topographical differences were found when comparing the different projection pattern. The labeled terminals were observed in the bilateral CCN with an evident ipsilateral prodominance and in the ipsilateral LCN after injecting in the spinal gray matter on one side. The present study suggests that segments of the spinal cord project to the ipsilateral central cervical nucleus and the lateral cervical nucleus.