大鼠脊髓至外侧网状核的纤维投射—WGA-HRP法研究

本研究将WGA—HRP注入25只大鼠脊髓灰质内,顺行追踪脊髓至外侧网状核的纤维投射。其结果为:颈髓注射例,标记终末投射至两侧外侧网状核尾側背外侧之大细胞部,小细胞部和三叉下部,以同侧大细胞部外侧区和邻近的小细胞部为密集。胸髓注射例也投射至外侧网状核大、小细胞部和三叉下部,但标记终末较少,两侧差异不显,主要标记终末占据外侧网状核的腹内侧区。腰髓注射例,主要投射至对侧外侧网状核的小细胞部及邻近的大细胞部,标记终末占据外侧网状核尾侧的腹内侧部。三叉下部接收从颈、胸、腰髓两侧来的投射纤维,标记终末腰髓稍显。

Spinal Projections to Lateral Reticular Nucleus in Rat

The spinal projection to the lateral reticular nucleus (LRN) was examined in 25 rats by the method of anterograde transport of Wheat Germ Agglutinin-Horseradish Peroxidase (WGA-HRP). WGA-HRP was injected into the cervical cord, the labeled terminals were found in all three parts of the nucleus. Maximum terminals were observed in the ipsilateral magnocellular part and its neighbouring parvocellular part. The fibers from the cervical cord terminated in the dorsolateral division of the caudal half of the LRN. In the cases of thoracic injection, a few labeled terminals were found in all three divisions of the nucleus. No significant could be seen between two sides. Dense terminal labeling was found in ventro-medial divisions of LRN. The lumbar fibers projected chiefly to parcocellular part and magnocellular part contralater(?)lly. Dense terminal labeling was also found in the ventro-medial part of the caudal half of LRN. Both sides of the subtrigeminal part of the nucleus received afferents from the cervical, thoracic and lumbar segments of the spinal cord. The labeled terminals were slightly prominent in the cases of lumbar injections.