Questions and Answers
Oval, one-side flattened with intense itching and inflammation in anal/vaginal area
Enterobius vermicularis
Barrel, football; hyaline polar plug at each end
Trichuris trichiura
May be corticated or decorticated in unfertilized and fertilized egg
Ascaris lumbricoides
Long buccal cavity, small genital primordium
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Short esophagus, pointed tail
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Short buccal cavity, prominent genital primordium
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Long esophagus, notched tail
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Study Notes
Morphological Characteristics of Parasitic Worms
- Oval shape with one side flattened, causing intense itching and inflammation in the anal or vaginal area
- Barrel-shaped or football-shaped with a hyaline polar plug at each end
- Eggs may have a cortical layer (corticated) or not (decorticated), both in unfertilized and fertilized states
Buccal Cavity and Esophagus Characteristics
- Long buccal cavity is associated with a small genital primordium
- Short buccal cavity is associated with a prominent genital primordium
- Short esophagus is a characteristic feature
- Long esophagus is accompanied by a notched tail
- Pointed tail is a distinct morphological feature
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