家兔胃前壁的神经支配——HRP法研究

THE INNERVATION OF THE ANTERIOR WALL OF THE STOMACH IN THE RABBIT. A STUDY WITH THE HRP METHOD

向成熟家兔胃前壁点状注入HRP溶液,发现迷走神经背核除吻、尾端外,全面出现标记细胞,但以闩上、下的部分最为密集。其分布状况是。背核的尾侧部标记细胞仅出现于其内侧部,向吻侧扩延于背内部,到闩的上下部分标记细胞全面地出现于核内,到核的吻侧部则数量少、无特有的定位关系。在背核背内方和最后区之间的地区也出现了一些散在的标记细胞。结状节内出现了大量标记细胞,小型细胞占40%以上。脊神经节在Th_(1)~L_(3)节段出现了一定数量的标记细胞,但Th_(3)~Th_(10)比较集中,显示着胃的经交感途径传入既有弥散性特点又有相对集中的节段性特点。脊神经节内的标记细胞都是30微米以下的中、小型细胞,各占半数。

10%and 20%HRP aqueous solution was injected into the anterior wall of the stomach of rabbit,and both the afferent and efferent nerve connections of this region were examined.1.Large number of labeled cells appeared in the dorsal motor nucleus of the vagus nerve(dmnX)on both sides throughout its whole length,except the very rostral and caudal ends of it.The labeled cells were more numerous in the middle part of the nucleus at levels above and below the obex.The distribution of the labeled cells showed certain localization characteristics.Those in the caudal part of the nucleus occupied the medial portion,those in the levels around the obex distributed widely in the nucleus,while in the rostral part they were smaller in number and showed no definite localization.2.In the area between the dorsomedial border of the dmnX and the area pos-trema,the so-called area subpostrema,some disseminated labeled cells,the form of which was similar to that the labeled cells in the dmnX,were also observed.3.Numerous labeled cells appeared in the nodose ganglia on both sides,the number of which was several times more than that in the spinal ganglia,indicating that the afferent connection of the stomach via the vagus nerve predominated over that via the sympathetic nerve.The small-sized labeled cells in the ganglion,however,appeared up to more than 40%of all the labeled cells in it,the functional significance of them,as well as the relation between them and the labeled small cells in the spinal ganglia,is worth further investigation.4.The labeled neurons appeared in the spinal ganglia from Th_(3)to L_(3),most of them were in Th_(3)to Th_(10),showing that the afferents of the stomach via the sympathetic system were diffusely arranged and at the same time concentrated in certain segments.5.Our observations confirmed that the stomach is innervated by elements of bilateral origin.In the vagus system the afferent and efferent neurons appeared almost equally in both dmnX and both nodose ganglia.And in the sympathetic system,the afferent neurons on the left side were 1 to 2 times more than those on the right,i.e.,the left side is predominant.