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HELMINTHS. Introduction. CHARACTERISTICS. Lack a digestive system. Nervous system reduced. Locomotion reduced or completely lacking. Reproductive system often complex. LIFE CYCLE. Larval. Dioecious. Monoecious. Hermophroditic. PLATYHELMINTHS- FLAT WORMS. Trematodes. Cestodes.
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HELMINTHS. Introduction.
CHARACTERISTICS. • Lack a digestive system. • Nervous system reduced. • Locomotion reduced or completely lacking. • Reproductive system often complex.
LIFE CYCLE. • Larval. • Dioecious. • Monoecious. • Hermophroditic.
PLATYHELMINTHS- FLAT WORMS. • Trematodes. • Cestodes.
FLUKES. • Clonorchis sinensis( Asian liver fluke ). • Paragonimus westermani (Lung fluke ).
CESTODES- TAPEWORMS. • Taenia saginata (Beef tapeworm). • Taenia solium (Pork tapeworm). • Echinococcus granulosus (Dog tapeworm).
NEMATODES- ROUNDWORMS. • Enterobius vermicularis - pinworm. • Ascaris lumbricoides. • Necator americanus- hookworm. • Trichinella spiralis.
ENTEROBIUS VERMICULARIS. • Adult pinworms found in the L.I. • Eggs deposited on the perianal skin. • Diagnosis- sticky tape.
ASCARIS LUMBRICOIDES. • Dioecious: Sexual dimorphism. • Eggs can survive soil for long periods. • Diagnosis- fecal smear.
NECATOR AMERICANUS. • Live in S.I. of man. • Eggs excreted in feces. • Larvae hatches and enters its host by penetration. • Diagnosis- fecal smear.
TRHINELLA SPIRALIS. • Acquired by eating undercooked/raw pork. • Trichinosis. • Larvae freed from cyst in human digestive tract.