鸡后海、大椎、足三里穴区神经支配脊髓节段性分布的示踪研究

Spinal Segment Distribution of Neural Innervation Related to Houhai Acupoint and Compared with Zusanli and Dazhui Acupoints in Domestic Chicken

目的研究鸡后海、大椎、足三里穴区神经支配的脊髓节段性分布。方法采用霍乱毒素B亚单位结合辣根过氧化物酶(CB-HRP)穴位注射追踪标记方法。结果 (1)后海穴跨节顺行标记纤维(LS8～14)密集于背角及背连合核处,逆行标记的神经元位于腹角并具有丰富的树突,在腹角的背面(Ⅶ板层)及背连合核中也有逆行标记神经元胞体。(2)大椎穴神经支配的脊髓节段分布在颈膨大的尾侧(C10～T2)。从背根和背角Ⅰ、Ⅱ层到Ⅸ层有相连续的较粗大的标记神经纤维,两侧背角有顺行的感觉纤维标记,腹角的标记运动神经元呈明显的内、外两组。背根神经节内阳性标记细胞,是三穴区中为数最多者。(3)足三里的感觉神经元节段在腰荐髓(LS8)与后海的感觉节段有重叠,在三穴区标记中,逆行标记的腹角运动神经元胞体最多。结论本研究显示了鸡后海、大椎、足三里穴区相关的脊髓节段性分布,即穴区相关结构在脊髓不同节段的顺行传入标记与逆行标记运动成份(躯体运动或内脏运动神经元)树突构筑间的相互关系。

The aim of this study was to demonstrate the spinal segmental innervation of Houhai, Dazhui and Zusanli acupoints in domestic chicken. Methods The horseradish peroxidase conjugated cholera toxin B subunit (CB-HRP) was injected into the regions of the three acupoints namely, Houhai Dazhui and Zusanli respectively in separate groups of chicken. The frozen sections of spinal cord and dorsal ganglia were prepare for labelling using TMB as a chromogen. Results (1) In Houhai group the anterograde transganlionic labelling terminals were densely distributed in the dorsal horn and dorsal commissure nucleus. The moto-neurons in ventral horn labelled retrogradely appeared fine arborization of dendrites. There were labelled cell bodies in the dorsal region of the ventral horn (lamina Ⅶ) or dorsal commissure nucleus. (2) In Dazhui group, the bundles of labelled fibers presented from laminea Ⅰ and Ⅱ to Ⅸ in the caudal cervical enlargements and two upper thoracic segments. The labelled motoneurons were shown in medial and lateral groups. The most numourous of labelled ganglionic cells appeared in this group. (3) The labelling sensory ganglionic neurons and their terminals in spinal cord related Zusanli acupoint were overlaped with those related Houhai acupoint. The largest numbers of the labelled ventral motoneurons occured in the Zusanli group. Conclusions The results demontrated the patterns of segmental innervation corresponding respectively to Houhai, Dazhui, and Zusanli acupoints. The anterograde afferent labelling terminals and interrelationship of the dendritic arborization of retrograde labelling motoneurons (somatic or visceral) provided neuroanatomical evidences for the innervation of the acupoints.