Wrobel K H, Mademann R, Sinowatz F
Cell Tissue Res. 1979 Nov;202(3):357-77. doi: 10.1007/BF00220431.
The boundary tissue of bovine testicular seminiferous tubules exhibits remarkable regional differences at the level of the seminiferous tubule proper, as compared with its terminal segment. The basal lamina of the seminiferous tubule proper is multilayered and possesses knob-like protrusions. At the level of the terminal segment the basal lamina is highly specialized; in the region of the terminal plug candelabrum-like projections of the tubular basal lamina invade the bases of the modified supporting cells up to a depth of 3.5 microns. The adjoining surface of these supporting cells is densely studded with hemidesmosomes. The elongated peritubular cells are arranged in 3--5 concentric layers around the tubulus seminiferus proper but form a loose association at the level of the terminal segment. Where the terminal segment joins the testicular straight tubule, peritubular cells may assemble to constitute a contractile spiral. Elastic tissue is situated mainly subjacent to the tubular basal lamina and to a lesser degree between the peritubular cell layers. A peritubular space lined by endothelium-like cells may surround the seminiferous tubule proper and also the transitional zone of the terminal segment.
与牛睾丸曲细精管的终末段相比，其生精小管的边界组织在生精小管本身水平呈现出显著的区域差异。生精小管本身的基膜是多层的，具有瘤状突起。在终末段水平，基膜高度特化；在终末栓区域，管状基膜的烛台状突起侵入修饰的支持细胞基部达3.5微米深。这些支持细胞相邻的表面密布着半桥粒。细长的睾丸白膜细胞围绕生精小管本身排列成3 - 5层同心层，但在终末段水平形成松散的结合。在终末段与睾丸直小管相连处，睾丸白膜细胞可聚集构成收缩螺旋。弹性组织主要位于管状基膜下方，在睾丸白膜细胞层之间的程度较小。由内皮样细胞衬里的睾丸白膜间隙可围绕生精小管本身以及终末段的过渡区。
