Class Cestoda General characters body Lacks body cavity

Class Cestoda General characters

body Lacks: • body cavity, • alimentary or vascular tracts absorption of nutrient molecules occurs through tegument.

Reproductive system (Cestodes are Hermaphrodite)

Excretory system Flame Cell

Eggs of cestodes passed with patient’s stool Immature Mature

Main Cestode Larvae Solid Procercoid Plerocercoid Cysticercous Cellulosae bovis Cysticercoid Cercocystic Hydatid Cryptocystic As in Diphyllobothrium latum With hooks Without hooks With tail In Taenia solium In Taenia saginata In Hymenolepis nana Without tail In Dipylidium caninum In Echinococcus granulus

Background of General life cycle of Cestodes Larval stage Egg of the worm Sometimes human act Adult worm Larval stage as D. H & I. H as In intestine in Larva in tissue (H nana, Taenia) Man is D. H Man is I. H The parasite is intestinal cestode The parasite is tissue cestode

General Life cycle • Life cycle lacks the presence of snail as intermediate host in contrast to Trematoda.

Human infection with cestoda • Human infection with adult stage (intestinal cestode) • Human infection with larval stages ( tissues cestode)