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目的 研究孤束核 (NST)、臂旁核 (PBN)至中央杏仁核 (CNA)纤维投射 ,为阐明三者对内脏心血管活动的调节机制提供形态学资料。方法 用辣根过氧化物酶 (HRP)逆行追踪标记技术 ,研究NST、PBN向CNA投射的起始神经元形态与分布。结果 在外侧臂旁核 (PBL)内见到大量中等大小圆形多极和梭形HRP标记细胞 ,在内侧臂旁核 (PBM)及Kolliker Fuse核仅见稀疏散在标记细胞。NST内见到中等量小而深染的椭圆形标记细胞 ,多集中于NST的尾侧 2 / 3处。结论 孤束核可直接或间接经臂旁核中继向杏仁核投射 ,为内脏心血管活动的重要传入途径之一。
Objective To study the projection of nucleus tractus solitarius (NST) and parabrachial nucleus (PBN) into the central amygdala (CNA) fibers and to provide morphological data for elucidating the regulatory mechanism of the three on visceral cardiovascular activity. Methods HRP retrograde tracing technique was used to study the morphology and distribution of primary neurons projecting from NST and PBN to CNA. Results A large number of medium sized round multipolar and spindle HRP-labeled cells were seen in the lateral parabrachial nucleus (PBL). Only sparsely scattered labeled cells were found in the medial parabrachial nucleus (PBM) and Kolliker Fuse nucleus. NST to see a small number of middle-sized and deep-stained oval-labeled cells, and more concentrated in the caudal NST 2/3 place. Conclusion The nucleus tractus solitarius can be directly or indirectly injected into the amygdala through the parabrachial nucleus, which is one of the important afferent pathways of visceral cardiovascular activity.