ULTRASTRUCTURAL OBSERVATIONS ON THE FORMATION AND METABOLISM OF CALCAREOUS CORPUSCLES IN CYSTICERCUS CELLULOSAE

目的：在超微结构水平研究猪囊尾蚴石灰小体的形成和代谢。方法：透射电镜。结果：石灰小体的形成可分成两个阶段：细胞内形成阶段和细胞外代谢阶段。石灰小体是在一种细胞内形成的，我们称为成石灰小体细胞。在形成的早期，石灰小体以分泌颗粒的形式出现在细胞内。随着石灰小体的发育，小体呈珠粒和板层样。此时，成石灰小体细胞胀大且细胞器消失。最后，小体聚集成致密黑色背景的颗粒，而成石灰小体细胞的核和细胞器全部消失。在一个成熟的成石灰小体细胞内有１－３或１０－２０个石灰小体。然后，小体释放到实质组织，随着代谢的消耗逐渐呈同心圆样的板层结构和空泡结构。结论：石灰小体是在一种细胞内形成，在实质组织的代谢过程中被消耗。

ULTRASTRUCTURAL OBSERVATIONS ON THE FORMATION AND METABOLISM OF CALCAREOUS CORPUSCLES IN CYSTICERCUS CELLULOSAE

AIM : To study the formation and metabolism of calcareous corpuscles from Cysticercus cellulosae at the ultrastructure level. METHODS: Transmission electron microscopy. RESULTS: The developmental processes of calcareous corpuscles could be divided into two stages: the intracellular formation stage and the extracellular metabolic stage. The calcareous corpuscles were formed in a cell which we named calcareous corpuscle forming cell. At the early stage of the formation, the corpuscles appeared to be secretory granules in the cells. With the development of the corpuscles, they became bead shaped and lamellae like, then the calcareous corpuscle forming cell enlarged and the organellae degenerated. Finally the corpuscles gathered to form particle substances with black dense background,while the nucleus and organellae of the forming cell all disappeared . There were 1-3 or 10-20 calcareous corpuscles in a mature forming cell. Then, the corpuscles were released to the parenchymal tissues and gradually appeared to be concentric lamella or an empty cavity during the metabolic process .CONCLUSION : The calcareous corpuscles were formed in calcareous corpuscle forming cell and consumed in metabolic process in the parenchymal layer of Cysticercus cellulosae.