17 Questions
What is the shape of the egg of Taenia saginata?
globular or spherical
What is the larval stage of Taenia saginata in cattle?
Cysticercus bovis
What is the habitat of the adult Taenia saginata worm?
Upper part of the small intestine of man
How do humans get infected with Taenia saginata?
By consuming undercooked or raw beef containing cysts
What is the diagnosis of Taenia saginata infection?
Stool examination for eggs or segments
What is a possible complication of Taenia saginata infection?
Both a and b
What is the shape of the scolex of Taenia solium?
Globular
How many lateral uterine branches are found in the gravid segment of Taenia solium?
7-13
How can humans get infected with Taenia solium?
Through ingestion of contaminated food and water, or through auto-infection
What is the intermediate host of Taenia solium?
Pig
What is the name of the larval stage of Taenia solium?
Cysticercus cellulosae
What is the disease caused by Taenia solium infection?
Taeniasis
What is the shape of the body of tapeworms?
Ribbon-like
Which of the following is an exception to the hermaphroditic nature of Platyhelminthes?
Schistosomes
What is the characteristic of the digestive system in Platyhelminthes?
It is absent or rudimentary
How many hosts do Diphylobotrium latum require during their life cycle?
Three
What is the characteristic of the anterior end of tapeworms?
It has a well-developed adhesive organ
Study Notes
Characteristics of Platyhelminthes (Flatworms)
- Flattened dorsoventrally, with some species microscopic and others up to 100 ft long
- Covered by a cytoplasmic tegument, lacking a body cavity
- Digestive system is either absent or rudimentary
- Excretory system contains ciliated cells extending into excretory tubules
- Most species are hermaphroditic, with adult worms reproducing sexually and larvae reproducing asexually
General Characteristics of Tapeworms (Cestodes)
- Utilize more than one host during their life cycle, except for Hymenolepis nana
- Have a ribbon-like shape, made up of many similar segments or proglottids
- Anterior end is the scolex, with a well-developed adhesive organ
- Adult tapeworms inhabit the small intestine of vertebrates, while larvae inhabit tissues of vertebrates and invertebrates
- Tapeworms are hermaphrodites, with both male and female reproductive organs in the same segment
Taenia saginata (Beef Tapeworm)
- Scolex is globular in shape, with 4 muscular suckers and 2 rows of hooks and rostellum
- Strobila consists of 800-1000 proglottides
- Gravid segment is longer than broad, with a median uterus and 7-13 lateral uterine branches
- Eggs are similar to those of Taenia solium
- Larval stage is Cysticercus bovis, an oval, fluid-filled bladder larva with an invaginated unarmed scolex
- Habitat: Upper part of the small intestine of humans
- Pathogenesis: Asymptomatic, but can cause acute intestinal obstruction and anemia
- Diagnosis: Stool examination for eggs or segments
Taenia solium (Pork Tapeworm)
- Scolex is globular in shape, with 4 muscular suckers and 2 rows of hooks and rostellum
- Strobila consists of 1000-2000 proglottides
- Gravid segment is longer than broad, with a median uterus and 7-13 lateral uterine branches
- Egg: Globular or spherical, yellowish-brown, with a hooked ball embryo (oncosphere) with 6 hooks (hexacanth embryo)
- Larval stage: Cysticercus cellulosae, a fluid-filled bladder larva with an armed invaginated scolex
- Habitat: Upper part of the small intestine of humans
- Pathogenesis: Causes Taeniasis or pork tapeworm infection
- Intermediate host: Pigs
- Final host: Humans
Test your knowledge of Taenia Saginata, a parasitic tapeworm, including its life cycle, hosts, and characteristics. Learn about the intermediate and final hosts, larval stages, and egg features.
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