Phylum Nematoda

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Phylum Nematoda

  1. 1. Presented by: Group 3 (Fantastic Amoeba)
  2. 2. Phylum Nematoda (Greek: thread) Defining Characteristics:  Paired amphids ( anterior chemosensory organs)  Vermiform with circular cross section(roundworms)  No Circulatory System  Excretory system: renette  Linear Digestive System  Syncytial  Undergo ensheathment  Undergo chromosome diminution
  3. 3. Trichuris trichiura Defining Charactristics:  “ Whip worm”  Most common gastrointestinal parasites of human  Lack lips  Have stichosome esophagus  Eggs possess plugs  Male have coiled posterior end Pathogenesis: Trichuriasis  Rectal prolapse  IH: none
  4. 4. Trichuris trichiura Taxonomic Key: Phylum: Nematoda Class: Aphamida Order: Trichurida Family: Trichuridae Genus:Trichuris Species: Trichuris trichiura
  5. 5. Trichuris trichiura Female Mouth Stichosome
  6. 6. Trichuris trichiura Male Mouth Stichosome Testes Copulatory spicule
  7. 7. Trichinella spiralis Defining Characteristics:  “ Trichina Worms”  One of the smallest nematode  Have calcified cystic wall  Pathogenesis: Trichinosis IH and DH: the same Diagnosis:  Xenodiagnosis
  8. 8. Trichinella spiralis Taxonomic Key: Phylum: Nematoda Class: Aphasmida Order: Trichurida Family: Trichinellidae Genus: Trichinella Species: Trichinella spiralis
  9. 9. Trichinella spiralis Encysted Larva
  10. 10. Capillaria Defining Characteristics:  Gradual caudal and cephalic transition  Eggs have two plugs with pits Pathogenesis: Capillariasis IH: fish  Capillaria philippinensis
  11. 11. Capillaria Taxonomic Key: Phylum: Nematoda Class: Aphasmida Order: Trichurida Family: Capillariidae Genus: Capillaria Species: Capillaria
  12. 12. Capillaria plugs  pits
  13. 13. Ascaris lumbricoides Defining Characteristics:  “Intestinal Roundworm”  Chromosome diminution  Have three lips  Coelomocytes (cells found in pseudocoel) Pathogenesis:  Ascariasis  Pneumonitis  Transplacental migration
  14. 14. Ascaris lumbricoides Taxonomis Key: Phylum: Nematoda Class: Phasmida Order: Ascaridida Family: Ascaridoidea Genus: Ascaris Species: Ascaris lumbricoides
  15. 15. Ascaris lumbricoides Female c.s. Cuticle Hypodermis Muscular layer Ovaries Intestine Uterus Pseudocoel
  16. 16. Ascaris lumbricoides Male c.s. Cuticle Hypodermis Muscular layer Testes Intestine Pseudocoel
  17. 17. Ascaris suum (Pig Ascaris) Taxonomic Key: Phylum: Nematoda Class: Phasmida Order: Ascaridida Family: Ascaridoidea Genus: Ascaris Species: Ascaris suum
  18. 18. Enterobius vermicularis Defining Characteritics: “Pinworms”  Cuticle is transparent  Have 3 small lips  Male is minute  Family affair Pathogenesis:  Itchiness and retrofection
  19. 19. Enterobius vermicularis Taxonomic Key: Phylum: Nematoda Class: Phasmida Order: Oxyurata Family: Oxyuroidea Genus: Enterobius Species: Enterobius vermicularis
  20. 20. Wuchereria bancrofti Defining Characteristics:  Invade lymphatic system and may cause abstruction of lymph passages. Pathogenesis Elephantiasis or filariasis IH: Anopheles mosquito
  21. 21. Wuchereria bancrofti Taxonomic Key: Phylum: Nematoda Class: Phasmida Order: Ascaridida Family: Filarioidea Genus: Wuchereria Species: Wuchereria bancr
  22. 22. Wuchereria bancrofti
  23. 23. Ancylostoma caninum Defining Characteristics:  “Hookworm”  Dentin in buccal capsule  Male has copulatory bursa Pathogenesis Creeping eruption Filariform: infective larva Rhabditiform: juvenile stage
  24. 24. Ancylostoma caninum Taxonomic Key: Phylum: Nematoda Class: Phasmida Order: Stongylida Family: Ancylostomatidae Genus: Ancylostoma Species: Ancylostoma caninum
  25. 25. Ancylostoma caninum Rhabditiform
  26. 26. Ancylostoma caninum Filariform
  27. 27. Ancylostoma caninum Female Dentin/ teeth Buccal capsule Ovaries
  28. 28. Ancylostoma caninum Male Dentin/ teeth Buccal capsule Copulatory bursa
  29. 29.  How do you differentiate morphologically the adult forms and eggs of T. trichiura and Capillaria?  What is the characteristic of E. vermicularis eggs making it easily transmissible?  How do you differentiate morphologically the adult forms of Ascaris suum from A. lumbricoides  Differentiate: rhabditiform, filariform and microfilaria
  30. 30.  Describe and give the function: a. phasmids b. amphids c. renette d. meromyarial muscles e. polymyarial muscles  Describe the molting pattern of Nematodes. Which stage is usually infective to the host?  Why do eggs of Ascaris suum do not readily infect humans and vice versa?

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