PARA 410 Lecture Notes - Lecture 11: Trichuris Trichiura, Cestoda, Dioecy
12 Jun 2018
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Parasitology – lecture 11 (January 30th, 2018)
- What are the infectious stages of nematodes?
o Eggs OR
o L3
- What is the general body plan of nematodes; how does this differ from trematodes and cestodes, how is it
similar to trematodes
o Nematodes are round
o They are unsegmented
- How to nematodes move; compare this to trematodes and cestodes
o They have only longitudinal muscles so they undulate
o Trematodes and cestodes have another layer between their syntegument and cytotegument that allows
them to elongate or contract
- What are renette gland or cells?
o For excretion
- What are the characteristics of the nematode reproductive system?
o Dioecious
o Males only have 1 testes
▪ Tubular
o Females have 2 ovaries; anterior and posterior
▪ Tubular
- Explain the life cycle of nematodes
o Egg
o L1-4
o Adult
- What is special about larval growth throughout the life cycle
o They need to moult between each larval stage
Slide 2
- Known as the whipworm because of its shape
- Important:
o Shape
o Egg
Slide 3
- Petrified eggs: not alive
- We know that it has evolved with us throughout the years
Slide 4
- Focus on the human whipworm
Slide 5
- The curly tail in males
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Document Summary
What are the infectious stages of nematodes: eggs or, l3. What is the general body plan of nematodes; how does this differ from trematodes and cestodes, how is it similar to trematodes: nematodes are round, they are unsegmented. How to nematodes move; compare this to trematodes and cestodes: they have only longitudinal muscles so they undulate, trematodes and cestodes have another layer between their syntegument and cytotegument that allows them to elongate or contract. What are renette gland or cells: for excretion. What are the characteristics of the nematode reproductive system: dioecious, males only have 1 testes, tubular, females have 2 ovaries; anterior and posterior, tubular. Explain the life cycle of nematodes: egg, l1-4, adult. What is special about larval growth throughout the life cycle: they need to moult between each larval stage. Known as the whipworm because of its shape. We know that it has evolved with us throughout the years. Eggs are very distinct bipolar plugs (trademark characteristic)
