大鼠腰骶髓中间带外侧核向臂旁核的投射——BDA顺行追踪研究

为了解贫办脏器感觉信息的传递道路，用结合生物素的葡聚糖妥作为顺行追踪剂，研究了大鼠腰骶髓中间带外侧核向脑桥臂旁核的投射。将ＢＤＡ注射酝中间带外侧核后，顺行标记的轴突终末出现于双侧的臂旁核，同侧略大。大量的ＢＤＡ标记的轴突终末出现于臂旁外侧核的外侧内核和外侧中央核，少量分布于外侧背核。

PROJECTION FROM THE LUMBOSACRAL INTERMEDIO LATERAL NUCLEUS TO THE PARABRACHIAL NUCLEUS IN THE RAT: AN ANTEROGRADE STUDY WITH BIOTINYLATED DEXTRAN AMINE

Projection from the lumbosacral intermediolateral nucleus to the parabrachial nucleus was examined by using an anterograde labeling method. After injection of biotinylated dextran amine (BDA) into the lumbosacral intermediolateral nucleus, many BDA labeled axon terminals were found in the parabrachial nucleus with a light ipsilateral dominance. Most of anterogradely labeled axon terminals were observed in the internal lateral and central lateral nuclei of the lateral parabrachial nucleus (LPB), and a few were seen in the dorsal lateral nucleus of the LPB, Klliker Fuse nucleus and the middle part of the medial parabrachial nucleus. The present results showed that projection neurons from the lumbosacral intermediolateral nucleus mainly terminated in the internal lateral and central lateral nuclei of the LPB, and it is suggested that the LPB, especially the internal lateral and central lateral nuclei of the LPB, may act as a relay site for transmission of pelvic visceral sensory information.