Tahara H
Department of Urology, School of Medicine, Fukuoka University, Japan.
J Anat. 1990 Jun;170:183-91.
The three-dimensional arrangement of muscle fibres and nerve elements in the rabbit ureter was examined by scanning electron microscopy after removal of fibrous elements by the HCl-trypsin digestion method. The ureteral muscle coat consisted of an interlacing network of muscle bundles made up of varying numbers of smooth muscle cells. On the outer surface of the muscle coat the muscle bundles predominantly extended transversely but some of them continued longitudinally. Some small bundles diverged from the main bundle and joined up with neighbouring or distant bundles. In most regions of the muscle coat irregular membranous or bifurcating cells were sometimes observed. On the longitudinally cut surface of the ureter, polygonal profiles of the cross-sectioned cells and elongated profiles of the longitudinally-sectioned cells were observed in the same bundle. The variety of these cut profiles suggested the differing directions of the muscle Some small interconnecting bundles extended across the inter-bundle spaces. Neighbouring muscle cells were connected laterally by short processes and were joined by gap junctions and desmosomal junctions; these were seen by transmission electron microscopy in thin sections and by freeze-fracture replicas. Thread-like nerve fibres were seen to be lying individually or in a fasciculus. Their terminals were characterised by varicose swellings. Streaks indicting mesaxonal extensions were exhibited on the Schwann cells enclosing nerve fibres.
采用盐酸 - 胰蛋白酶消化法去除纤维成分后，通过扫描电子显微镜检查了兔输尿管中肌肉纤维和神经成分的三维排列。输尿管肌层由由不同数量平滑肌细胞组成的交织肌束网络构成。在肌层外表面，肌束主要横向延伸，但其中一些纵向延续。一些小束从主束分出并与相邻或远处的束相连。在肌层的大多数区域，有时会观察到不规则的膜状或分叉细胞。在输尿管的纵向切面上，同一束中观察到横截面细胞的多边形轮廓和纵向切片细胞的细长轮廓。这些切面轮廓的多样性表明肌肉方向不同。一些小的相互连接束穿过束间空间延伸。相邻的肌肉细胞通过短突起横向连接，并通过缝隙连接和桥粒连接相连；这些在薄切片的透射电子显微镜和冷冻断裂复制品中可见。线状神经纤维单独或成束存在。它们的末端以曲张肿胀为特征。在包裹神经纤维的施万细胞上可见指示轴突延伸的条纹。
