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Parasitology

Parasitology. Lab # 3- Cestodes 1. General characters. 1- All tape worms consist of long, multi-segmented body. 2- Cuticle of the body is provided with pores through which the worm takes its nutrients (no digestive system). 3- All are hermaphroditic.

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Parasitology

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  1. Parasitology Lab # 3- Cestodes 1

  2. Generalcharacters 1- All tape worms consist of long, multi-segmented body. 2- Cuticle of the body is provided with pores through which the worm takes its nutrients (no digestive system). 3- All are hermaphroditic.

  3. The adult worm is divided into 3 distinct parts: head (scolex), neck and strobilla. a- Head or scolex:Usually provided with muscular suckers and crown of hooks (rostellum) to attach to intestinal wall. b- Neck region:Serves as generative organ. c- Strobilla:The long segmented body consists of three types of segments: Immature segments: follow the neck region and contain immature sex organs. Mature segments: containing both sex organs & responsible for reproduction. Gravid segments: filledwith fertilized eggs.

  4. Generalcharacters 5- Eggs: Contain hexacanth embryo (oncosphere). 6- All cestodes have intermediate host except Hymenolepis nana.

  5. General Life Cycle of cestodes

  6. Examples of Class Cestoda

  7. Life cycle of Taeniaspp. Infective Stage Final Host Intermediate Host Diagnostic Stage

  8. 1. Taeniasaginata(beef tape worm)

  9. 1. Taeniasaginata(beef tape worm) • Length: up to 10 m

  10. 1. Taeniasaginata(beef tape worm)

  11. 1. Taeniasaginata(beef tape worm)

  12. 2. Taeniasolium(pork tape worm)

  13. 2. Taeniasolium(pork tape worm) Length: 2-8 m

  14. 2. Taeniasolium(pork tape worm)

  15. 3. Hymenolepisdiminuta(rat tape worm) Infective Stage Final Host Intermediate Host Diagnostic Stage

  16. 3. Hymenolepisdiminuta(rat tape worm)

  17. 3. Hymenolepisdiminuta(rat tape worm) Length:20-60 cm

  18. 3. Hymenolepisdiminuta(rat tape worm)

  19. 4. Hymenolepis nana (dwarf tape worm) NO Intermediate Host Final Host Infective & Diagnostic Stage

  20. 4. Hymenolepis nana (dwarf tape worm)

  21. 4. Hymenolepis nana (dwarf tape worm) Very small 15-40 mm

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