Schimming Bruno Cesar, Machado Márcia Rita Fernandes, Simões Karina, da Cruz Claudinei, Domeniconi Raquel Fantin
Department of Anatomy, UNESP, District of Rubão Júnior, Botucatu, São Paulo, Brazil.
Ital J Anat Embryol. 2013;118(1):119-27.
The features of paca epididymis, based on its appearance in light microscope, is described in this paper. The cellular population of the epithelial lining comprises principal cells, basal cells, apical cells, narrows cells, and hallo cells. The epididymis is divided in five distinct and continuous regions, Zone I, or initial segment, and zone II, are both localized into the head. Zone III comprises the distal head and all the body. Zones IV and V are restricted to the tail, in the proximal and distal cauda epididymis respectively. Each zone can be readily distinguished on the basis of morphological characteristics. The height of epididymal epithelium is greater in zone I. There is a progressive increase in the diameter of the tubular lumen through the different areas, with the maximum in the zone V. The presence of a high epithelium, and the virtual absence of sperm in zone I suggest fast transit of spermatozoa in this region. Zone V comprises the distal tail, has smaller epithelial lining, greater luminal diameter, shorter stereocilia than the other zones, and contains spermatozoa packed inside the lumen, that characterizes this zone as a place of sperm storage. The findings are compared with other reports in rodents and other domestic animals, to contribute to the understanding of epididymal morphophysiology.
本文描述了刺豚鼠附睾在光学显微镜下的特征。上皮衬里的细胞群体包括主细胞、基底细胞、顶端细胞、狭窄细胞和晕细胞。附睾分为五个不同且连续的区域，I区或起始段以及II区都位于头部。III区包括远端头部和整个体部。IV区和V区分别局限于尾部的近端附睾尾和远端附睾尾。每个区域都可以根据形态特征轻松区分。I区附睾上皮的高度更高。通过不同区域，管腔直径逐渐增大，在V区达到最大。I区存在高上皮且几乎没有精子，这表明精子在此区域快速转运。V区包括远端尾部，其上皮衬里较小，管腔直径较大，静纤毛比其他区域短，并且管腔内充满精子，这使得该区域成为精子储存的场所。将这些发现与啮齿动物和其他家畜的其他报告进行比较，以有助于理解附睾的形态生理学。
