摘要
目的 探讨大鼠颈髓中央核向前庭神经外侧核的定位投射。方法 本实验通过向脊髓内单侧注射菜豆—白细胞凝集素 ,在不同节段上对由脊髓向前庭神经核的纤维投射做顺行示踪。结果 在颈髓颈 2和颈 3节段包括颈髓中央核单侧注射示踪剂后 ,应用免疫组织化学法在对侧前庭神经下核以及前庭神经内侧核的大型细胞、小型细胞部和尾部内可见大量标记终末。在对侧前庭神经外侧核由头部至尾部整个范围内 ,标记物数量最多 ;在颈膨大处单侧注射示踪剂后 ,在对侧前庭神经内侧核的大型细胞部见很多标记轴突和终末 ,但在前庭神经外侧核和前庭神经下核内 ,仅见少量标记轴突和终末。在颈膨大以下脊髓节段注射示踪剂后 ,在前庭神经内侧核的大型细胞部、前庭神经下核及前庭神经外侧核的尾部标记纤维和终末仅零星存在。结论 颈部初级传入纤维经过颈中央核中继后 ,可直接投射到对侧前庭神经外侧核 ,同时 。
Objective To investigate the projections of the central cervical nucleus to the lateral vestibular nucleus in rat. Methods Injections of Phaseolus vulgaris leucoagglutinin in to various segments of the spinal cord in the rat were done unilaterally. And then, the tracers were examined in the vestibular nucleus by immunohistochemistry. Results After unilateral injections of the tracers into the C2 and C3 segments containing the central cervical nucleus, labeled terminals were seen in the contralateral inferior vestibular nucleus, and the parvocellular, magnocellular, and caudal parts of the contralateral medial vestibular nucleus throughout its rostrocaudal extent. Labeled terminals were most in number in the contralateral lateral vestibular nucleus throughout its rostrocaudal extent. Following tracer injections in the cervical enlargement unilaterally, many labeled terminals were seen in the magnocellular part of the contralateral medial vestibular nucleus, but a few were seen in the lateral and the inferior vestibular nucleus. Injections into segments below cervical enlargement resulted in sporadic terminal labeling in the magnocellular part of the medial vestibular nucleus, the inferior vestibular nucleus, and the caudal part of the lateral vestibular nucleus. Conclusions The primary neck afferent input relayed at the central cervical nucleus is mediated directly to the contralateral lateral vestibular nuclei. Meanwhile, the findings also suggest that the central cervical nucleus may be an integration and relay site for the primary neck afferent input.
出处
《解剖科学进展》
CAS
2004年第3期199-202,共4页
Progress of Anatomical Sciences
