狗胆囊传出神经的脑干起始神经元CT—HRP法研究

幼狗10只,将CT-HRP注入胆囊壁,在脑干发现:1.迷走神经背核中标记细胞分布于除吻尾侧外的该核全长,闩前2mm到闩后1mm最为密集,占总标记细胞的75.93％。在该核的横切面上,自尾侧开始,标记细胞在核的内侧和腹侧缘,继之在核的腹侧份呈横向排列,稍前,随该核由横位移行为斜位,标记细胞也随之成斜位,近吻侧标记细胞逐渐消失。细胞形态以中小型的椭圆形者居多,次为多角形和梭形。其突起横向伸展,有个别突起伸入第四脑室底室管膜内。2.疑核和外侧网状核中分别有25个和38个标记细胞,其形态为多角形或近圆形。

ORIGINATING NEURONS OF THE EFFERENT NERVES TO GALL BLADDER IN THE BRAIN STEM IN DOG WITH THE CT-HRP METHOD

The results shoved that a lot of labeled cells appeared bileterally in the dorsal motor nucleus of the vagus nerve (DNV) throughout the length, except the part of very rostral and caudal of it. Most of the labeled cells (75.93%) were distributed in the middle part of the nucleus at a level 2mm rostral and 1mm caudal from the obex. The distribution of the labeled cells indicated certain localization characteristics. In the caudal part of the nucleus, the labeled cells occupied the ventral and medial margin, and arranged nearly transversal in the ventral portion. The labeled cells arranged in slant when DNV located from transverse to slant in the upper part around the opening of the central canal. In the rostral part, the labeled cells were less in number and showed no definite localization. In the DNV, the dendrite of the labeled cells near the bottom part of the 4th ventricle extended into the ependyma of the 4th ventricle. In addiion, a few labeled glls appeared in the nucleus ambiguus and nucleus reticularis lateralis.