Exercise 15

• Cestodes are members of what Phylum?

  Platyhelminthes
• Platyhelminthes are also known as what?

  Flatworms
• Cestodes have a DISTINCT manner of development and DOESN’T have what?

  Digestive Tract
• Flatworms are also called as what because of its TAPE-LIKE or RIBBON-LIKE appearance?

  Tapeworms
• Tapeworms consist of a colony like chain of what?

  flattened segments
• The flattened segments are what?

  semi-independent unit
• The flattened segments has a complete set of what?

  reproductive organs
• Humans are either what of tapeworms?

  Definitive or intermediate host
• Definitive hosts results in what?

  Intestinal infection
• Intermediate host results in what?

  more serious tissue infections
• Give the components of a tapeworm?

  Scolex, neck, and proglottids
• This is also called the Head of the of tapeworm?

  Scolex
• This is also called the series of segments found in tapeworms?

  Proglottids
• Each proglottid usually contains how many sets of MALE and FEMALE REPRODUCTIVE ORGANS?

  1 or 2
• Proglottid houses what?

  Male and female reproductive organs
• The HEAD is EXTREMELY SMALL, often only PINHEAD in size in comparison with the body.
• The scolex is provided with either or both of what?

  Suckers or hooklets
• Suckers or hooklets: used to attach to the INTESTINAL WALL
• Treatment that fails to recover the SCOLEX, regardless of the number of SEGMENTS removed, is of no value because the SCOLEX immediately begin to replace the lost SEGMENTS.
• What are the MOST COMMON tapeworms infecting men?

  Taenia saginata and Taenia solium.
• Taenia saginata: beef tapeworm
• Taenia solium: pork tapeworm
• T. saginata and T. solium are quite similar to each other but are most easily differentiated by the number of what in where?

  UTERINE BRANCHES in GRAVID SEGMENTS
• How many uterine branches do T. saginata have?

  about 20
• How many uterine branches does T. solium have?

  about 10
• What are the 2 orders under Class Cestoda?

  Cyclophyllidea and Pseudophyllidea
• What are the intermediate hosts of Diphyllobothrium latum?

  Copepods and freshwater fish
• What is the intermediate host of Taenia saginata?

  Cattle or Cow
• What is the intermediate host of Taenia solium?

  Pigs
• What is the intermediate host of Hymenolepis nana?

  None
• What is the intermediate host of Hymenolepis diminuta?

  Grain beetle or flea, cockroaches, mealworms, and earwig
• What is the intermediate host of Dypylidium caninum?

  Dog, cat, and human flea and dog louse
• What is the infective stage of Diphyllobothrium latum?

  Plerocercoid larvae
• What is the infective stage of Taenia saginata?

  Cysticercus bovis
• What is the infective stage of Taenia solium?

  Cysticercus cellulosae
• What is the infective stage of Hymenolepis nana?

  Cysticercoid larvae
• What is the infective stage of Hymenolepis diminuta?

  Cysticercoid larvae
• What is the infective stage of Dipylidium caninum?

  Cysticercoid larvae