CAJ | 학술논문

本研究应用透射电子显微镜研究了扩张莫尼茨绦虫原肾管的细胞学特征,莫尼茨绦虫原肾管的焰茎球为一个过滤器结构,类似于"挡河坝"样构造,此构造由端细胞和近管细胞外突形成的肋条(或称杆)相互交错排列而成.肋条之间由细胞外物质构成的"膜"结构连接,过滤作用通过该"膜"发生.焰细胞与近管细胞交界处有裂缝或孔与细胞外的结缔组织(实质组织)相通;原肾管的毛细排泄管细胞质索之间没有隔状联结;毛细排泄管及排泄管的管腔内有大量珠状微绒毛突起以增加表面积.从扩张莫尼茨绦虫及其它一些无脊椎动物原肾管的研究结果表明,原原肾管概念将焰细胞作为封闭的盲端已不再合适,需要进行修订,建议修订为:原肾管是一种焰细胞系统,通常由焰细胞、管细胞和肾孔细胞组成,焰茎球作为过滤装置与周围的结缔组织(实质组织)有或没有裂缝(孔)相通[动物学报50(4):638-644,2004].
본연구응용투사전자현미경연구료확장막니자조충원신관적세포학특정,막니자조충원신관적염경구위일개과려기결구,유사우"당하패"양구조,차구조유단세포화근관세포외돌형성적륵조(혹칭간)상호교착배렬이성.륵조지간유세포외물질구성적"막"결구련접,과려작용통과해"막"발생.염세포여근관세포교계처유렬봉혹공여세포외적결체조직(실질조직)상통;원신관적모세배설관세포질색지간몰유격상련결;모세배설관급배설관적관강내유대량주상미융모돌기이증가표면적.종확장막니자조충급기타일사무척추동물원신관적연구결과표명,원원신관개념장염세포작위봉폐적맹단이불재합괄,수요진행수정,건의수정위:원신관시일충염세포계통,통상유염세포、관세포화신공세포조성,염경구작위과려장치여주위적결체조직(실질조직)유혹몰유렬봉(공)상통[동물학보50(4):638-644,2004].
Transmission electron microscopic observations have been made on the protonephridium of the cestode Moniezia expansa. The flame bulb of M. expansa has a filtration apparatus constructed as a "weir" and consisting of ribs (rods)which are outgrowths of the terminal cell as well as the proximal canal cells. The ribs are connected by a "membrane" of extracellular substance through which filtration is believed to occur. Pores connect the protonephridial lumen to the intercellular space of connective tissue (parenchyma) and are located at the junction of a flame cell and a proximal canal cell.The cytoplasmic cords of protonephridial capillaries do not contain a septate junction. The surface area of the capillaries and other protonephridial ducts lining the lumen is enlarged by many small bead-like microvilli. From the present study of M. expansa and from those of protonephridia in other invertebrates, it is suggested that the concept of defining a protonephridium as having a closed inner end is improper. We suggest its definition should be modified as follows: a protonephridium is a flame cell system consisting of flame cells, canal cells and nephropore cells and that the flame bulb functions as a filtration apparatus with or without slits (pores) opening to the intercellular space of connective tissue (parenchyma) [Acta Zoologica Sinica 50 (4): 638-644, 2004].