Vincent A L, Frommes S P, Ash L R
J Parasitol. 1979 Apr;65(2):246-52.
The authors have examined the ultrastructure of the rectum of infective-stage Wuchereria bancrofti by transmission electron microscopy. Our observations show that the rectum is divided into anterior and posterior segments. The cells of the anterior rectum appear to be derived from the microfilarial R (rectal) cells described by other authors. In both stages, these cells show voluminous nuclei, abundant mitochondria, and small cytoplasmic processes which contain fibrillar components. Amorphous material associated with these processes appears throughout the larval rectum and may protrude from the anus as the rectal plug. In the specimens examined, a patent lumen could not be traced completely through the anterior rectum. The posterior rectum has no counterpart in published accounts of microfilarial ultrastructure and probably arises during larval morphogenesis; it is lined with invaginated body cuticle, overlaid by a single layer of epithelial cells which may be of hypodermal origin.
作者通过透射电子显微镜检查了感染期班氏吴策线虫直肠的超微结构。我们的观察结果表明，直肠分为前段和后段。直肠前段的细胞似乎源自其他作者描述的微丝蚴R（直肠）细胞。在两个阶段，这些细胞都显示出大量的细胞核、丰富的线粒体以及含有纤维成分的小细胞质突起。与这些突起相关的无定形物质出现在整个幼虫直肠中，并可能作为直肠栓从肛门突出。在所检查的标本中，未能完全追踪到穿过直肠前段的通畅管腔。直肠后段在已发表的微丝蚴超微结构描述中没有对应物，可能在幼虫形态发生过程中出现；它内衬内陷的体壁角质层，上面覆盖着单层上皮细胞，这些上皮细胞可能起源于皮下组织。
