Introduction: Cestodes are ribbon-shaped worms which inhabit the intestinal tract. They have no alimentary system and absorb nutrients through the tegumental surface. The anterior end, or scolex, has suckers for attaching to the host. From the scolex arises a series of progressively developing segments, the proglottides, which, when shed, may continue to show active movements. Adult Tape Worm Cross-fertilisation takes place between segments. Ova, present in large numbers in mature proglottides, remain viable for weeks and during this period they may be consumed by the intermediate host. Larvae liberated from the ingested ova pass into the tissues, forming larval cysticerci. Cestodes or tapeworms include: Intestinal tapeworms: Taenia saginata, T. solium, Diphyllobothrium latum, Hymenolepis nana. Tissue-dwelling cysts or worms: Taenia solium, Echinococcus granulosus . Tapeworms cause two distinct patterns of disease: intestinal infection systemic cysticercosis...
Comments
Post a Comment