tailieunhanh - Ebook Textbook of medical parasitology (6th edition): Phần 2

(BQ) Part 2 book "Textbook of medical parasitology" presents the following contents: Trematodes flukes, cestodes tapeworms, nematodes general features, trichinella spiralis, whipworm, strongyloides, hookworm, pinworm, roundworm, guinea worm, miscellaneous nematodes, diagnostic methods in parasitology. | CHAPTER 9 Trematodes Flukes Termatodes are unsegmented helminths which are flat and broad resembling the leaf of a tree or a flatfish hence the name Fluke from the Anglo-Saxon word floc meaning flatfish . The name Trematode comes from their having large prominent suckers with a hole in the middle Greek trema hole eidos appearance . They vary in size from the species just visible to the naked eye like Heterophyes to the large fleshy flukes like Fasciola and Fasciolopsis. Medically important members of the class Trematoda belong to the subclass Digenea as they are digenetic . require two hosts. The definitive hosts in which they pass the sexual or adult stage are mammals humans or animals and the intermediate hosts in which they pass their asexual or larval stages are freshwater molluscs or snails. FLUKES GENERAL CHARACTERS Flukes are hermaphroditic monoecious except for schistosomes in which the sexes are separate Fig. . A conspicuous feature is the presence of two muscular cup-shaped suckers hence called Distomata the oral sucker surrounding the mouth at the anterior end and the ventral sucker or acetabulum in the middle ventrally. The body is covered by an FIGURE Morphology of a hermaphroditic trematode 1. Oral sucker 2. Pharynx 3. Genital pore 4. Ventral sucker 5. Uterus 6. Caecum 7. Cirrus 8. Ovary 9. Flame cell 10. Testis 11. Excretory bladder Trematodes Flukes 117 integument which often bears spines papillae or tubercles. They have no body cavity circulatory or respiratory organs. The alimentary system consists of the mouth surrounded by the oral sucker a muscular pharynx and the oesophagus which bifurcates anterior to the acetabulum to form two blind caeca which reunite in some species. The alimentary canal therefore appears like an inverted Y. The anus is absent the excretory system consists of flame cells and collecting tubules which lead to a median bladder opening posteriorly. There is a rudimentary nervous system consisting of paired ganglion

• Y khoa - Dược
• Textbook of medical parasitology
• Trematodes flukes
• Cestodes tapeworms
• Nematodes general features
• Trichinella spiralis
• Miscellaneous nematodes
• General introduction
• Protozoa general features
• Malaria parasites
• Miscellaneous sporozoa and microspora
• Ciliate protozoa