发育过程中的猪带绦虫囊尾蚴的组织学观察(英文)

HISTOLOGICAL OBSERVATIONS ON TAENIA SOLIUM CYSTICERCI IN THE DEVELOPMENT

目的 系统地研究猪囊尾蚴发育过程中的组织结构变化。 方法 仔猪感染猪带绦虫卵不同时间后剖杀 ,取囊尾蚴寄生部位作病理组织学检查。 结果 同一宿主不同部位甚至同一宿主同一部位囊尾蚴的组织结构发育程度不同。感染后 19d在骨骼肌中即有幼年期囊尾蚴出现 ,组织学检查显示了头节的早期发育 ,其他组织器官内未发现有囊尾蚴寄生。感染后 30 d骨骼肌内寄生的囊尾蚴出现小钩及吸盘的雏形。随着猪囊尾蚴体内发育时间的延长 ,头节区逐渐分化 ,出现吸盘及折叠。感染后 6 0 d,骨骼肌内寄生的囊尾蚴头节区出现较大的吸盘和大量折叠。70 d以后的囊尾蚴在组织学结构上和 6 0 d的囊尾蚴相似。在每一发育阶段均有退化变性的囊尾蚴出现。(本文图 1～ 6 ,见封底 ) 结论 猪囊尾蚴的最早出现时间大约是感染后 19d,而成熟时间大约是感染后 6 0 d。在猪囊尾蚴的组织结构发育过程中囊壁相当于暂时的胚胎 ,头节在囊壁的基础上分化而来。

Objective To systematically study the changes of histological structure of Taenia solium cysticerci in the development. Methods At the different periods after infected with T. solium eggs, pigs were autopsied and blocks of the tissues with cysticerci were made into histological sections. Results The developmental extent of cysticerci was variable in the different parts or even a same part in a same host. The youngest cysticerci were observed in skeletal muscles 19 days after infection. Histological examination revealed obvious early development of scolex. No cysticerci were found in other tissues or organs. 30 days after the infection, hooklets and brood suckers had appeared in the cysticerci from skeletal muscles. With the duration of infection, scolex began to differentiate and possessed suckers and fewer folds. At 60 days, there were a larger sucker and more folds. The cysticerci at 70 days and afterward were similar to those seen at 60 days in histology. In every developmental stage there existed degenerated cysticerci. Conclusion The appearing of cysticerci is at about 19 days and the mature is at about 60 days after infection. During the development the bladder wall was a transitory embryo, on the basis of which the scolex developed.