蛔蟲(chóng)鉤蟲(chóng)蟯蟲(chóng)ppt課件(存儲(chǔ)版)
【正文】 M3 M4 Egg L1 L2 L3 L4 Adult larva (male amp。m by 3547 181。m by 2223 181。 female) Kinds of life cycle in nematodes Ascaris lumbricoides Trichuris trichiura Enterobius vermicularis Hookworms Indirect life cycle: intermediate host is necessary Trichinella spiralis Filaria Direct life cycle: Intermediate host is not necessary 土源性線蟲(chóng) （腸道線蟲(chóng)） 生物源性線蟲(chóng) Pathogenesis 1)Larvae： ( 1) dermatitis caused by cutaneous invasion and subcutaneous migration of larva。m Contains: clear space between the eggshell and the ovum. Usually 2 to 16 cells in feces Morphology－ Eggs of hookworms Morphology－ Eggs of hookworms Life cycle Life cycle of Ascaris lumbricoides Adult egg infective egg larva Ingested by man migration Life cycle Migration of larva in the host: Vessels of intestine liver heart lungs trachea pharynx intestine (swallowed) Life cycle of hookworm Life Cycle Adult egg rhabditiform filariform larva larva Swallowed pharynx trachea lung circulation Perate skin Life cycle of Enterobius vermicularis Life cycle ingested Adult egg infective egg (in lumen of cecum) Pathogenesis Pathogenesis of Ascaris lumbricoides 1) larvae: Ascaris Pneumonitis Asthma Larva in section of lung Pathogenesis 2) Adults： (1) Malnutrition (2) Disorder of digestive system: main plaint abdominal pain (3) Allergic responses anorexia (食欲不振 ) nausea (惡心 ) vomiting (嘔吐 ) diarrhea (腹瀉 ) Complication 并發(fā)癥 perate to bile ducts perate to the pancreatic and the appendix 膽道蛔蟲(chóng)癥 胰腺 闌尾 intestinal obstruction 腸梗阻 Ectopic parasitism 異位寄生 1. cause irritation( pruritus 搔癢 ) of the anal region Secondary bacteria
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