스파르가눔 표피의 전자현미경적 관찰

Abstract

The tegument of Sparganum mansoni was observed through scanning and transmission electron microscope on the scolex , neck and tail parts. The tegument had the general surface structure of cestodes in all 3 parts observed. However, the microtriches were observed in 3 types; pyramidal (Type 1), filariform (Type 2) and bulb·rooted (Type 3). 398 The pyramidal microtrix had a short proximal part and a long and electron dense distal part. Both parts revealed rhomboidal or triangular cut surface at cross section. Microtriches of this type were abundantly distributed on the tegument of scolex portion. It was supposed to be related with the role of scolex , such as movement, penetration into host tissue and survival or positioning in the host. The filariform type microtrix was short, slender and less electron dense. It was the dominant type among those distributed on the tegument of neck to tail portions. This type was thought to be important in absorptive function of the worm. The bulb·rooted microtrix had distinctively wide and round proximal part, which was round in cross sections. It randomly intervened among filariform microtriches from neck to tai l. The microtrix of this type was also considered to be the locus of membrane phenomena of this larval cestode The microtriches decreased in length and density gradually from scolex to tai l. Also the packets of secretory granule and pit organelle were observed in tegumental and subtegumental layers