《人体寄生虫学 Human parasitology》课程教学课件（讲稿）Lectures 2.Trematoda & Clonorchis sinensis

LastclassParasitism;Parasite;Ectoparasite;Endoparasite;Obligate parasite;Accidentalparasites; Intermediate host; Definitive host;Reservoir host; Paratenic host; Life cycle;InfectiveStage;Carrier;Patient

Last class Parasitism; Parasite; Ectoparasite; Endoparasite; Obligate parasite; Accidental parasites; Intermediate host; Definitive host; Reservoir host; Paratenic host; Life cycle; Infective Stage; Carrier;Patient

The Scope of Human ParasitologyThreemajorgroups of human parasites·Protozoa:one-cell organismHelminth:multiplecells(Trematoda,Cestoda,Nematoda)Arthropods:

The Scope of Human Parasitology •Three major groups of human parasites •Protozoa: one-cell organism •Helminth: multiple cells ( Trematoda, Cestoda, Nematoda) •Arthropods:

HELMINTHOLOGYP151

HELMINTHOLOGY P151

Introduction to helminthplio。 Helminth means worm. multicellular bilalerallysymmetrical animals The helminth of medicalimportance belong to 3 classes: Trematoda ,CestodaandNematoda

Introduction to helminth p110 • Helminth means worm. multicellular bilalerally symmetrical animals The helminth of medical importance belong to 3 classes: Trematoda ,Cestoda and Nematoda

Importantfeaturesofhelminths1. Adult worm.Teeth of cuttingplates; suckers orhooks.Donotpossessorgansoflocomotion,Locomotion by muscular contraction and relaxation·Reproductivesystemmonoeciousdiecious2. Eggs3.larvae

Important features of helminths 1. Adult worm • Teeth of cutting plates; suckers or hooks • Do not possess organs of locomotion, • Locomotion by muscular contraction and relaxation • Reproductive system: • monoecious • diecious 2. Eggs 3. larvae

TREMATODES :FLUKES P190

TREMATODES :FLUKES P190

吸虫Trematode店华枝吸虫布氏姜片虫卫氏并殖吸虫日本血吸虫斯氏狸殖吸虫（肺吸虫）（血吸虫）（肠吸虫）（肝吸虫）FasciolopsisPagumogonimusSchistosomaParagonimusClonorchisbuskiskrjabinijaponicumwestermanisinensis

GeneralcharacteristicsORALSUCKER1.Most adult trematodes arePHARYNXESOPHAGUSflattened,dorsoventrallyGENITALPORECIRRUSVAS DEFERENSbilaterallysymmetric, leaf-EXCRETORYDUCTACETABULUM-VITELLARIAINTESTINALCECUMshaped ortongue-like.TESTIS-UTERUSOVARY2.AllofthemhavetwoOVIDUCTMEHLIS' GLANDSsuckers, an oral and a ventralEXCRETORYBLADDERsucker

General characteristics 1.Most adult trematodes are dorsoventrally flattened, bilaterally symmetric, leaf￾shaped or tongue-like. 2.All of them have two suckers, an oral and a ventral sucker

3. The digestive tract isORALSUCKERdegenerate. The end of-PHARYNXESOPHAGUSGENITALPOREisintestineacecumCIRRUSVAS DEFERENSACETABULUMEXCRETORYDUCTwithout anus.VITELLARIAINTESTINAL CECUMTESTISUTERUS4. The reproductive systemOVARY福OVIDUCTisanddevelopedMEHLIS’ GLANDShermaphroditic except forEXCRETORYBLADDERschistosomes

3. The digestive tract is degenerate. The end of intestine is a cecum without anus. 4. The reproductive system is developed and hermaphroditic except for schistosomes

5.Eggs of most species have卵盖an operculum (lid) and/or肩峰毛蝴a small spine (knob). Thedeveloped egg contains amiracidium, except in thecase of schistosomes.疣状突起

5. Eggs of most species have an operculum (lid) and/or a small spine (knob). The developed egg contains a miracidium, except in the case of schistosomes