Observation on the ultrastructure of Coenurus cerebralis

To observe the ultrastructure of Coenurus cerebralis and find the sheep and goats naturally infected-C.cerebralis,C.cerebralis was gathered from the vital sheep which was naturally infected the eggs of Taenia multiceps,and fixed in the 25 mL/L glutaraldehyde.Ultrathin sections of scolex,cyst wall,cervical part of the C.cerebralis were observed by transmission electron microscope.The results indicated that the microtrichia could be seen on the cyst wall,microtrichia on cyst wall that away from scolex and cervical part of cyst wall were scattered differently.Cyst wall could be divided into tegument,matrix and parenchyma.Tegument cell,parenchyma cell,calcareous corpuscle cell,myoblast,flame cell and excretory system could be seen on the parenchyma region.Well developed muscle fiber could be found on scolex,and there were structures similar to the tegument on cyst wall,and thick microtriche inside the scolex.The kinds of cell decreased and the number of veses containing granula increased.The structure of cyst wall and variety of cells from C.cerebralis were similar to other tapeworms,and the excretory system of C.cerebralis was much more abundant.The outer structure of scolex was surrounded by fibers and veses without tegument in it.