Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

39 Cards in this Set

  • Front
  • Back
Cestodes are commonly referred to as ________.

-Flat, ribbon-like, segmented worms
Cestodes have ___ number of cup shaped suckers on scolex?
4 (except Diphyllobothrium latum which has 2 suctorial grooves)
Cestodes require a _________ host?
Proglottids contain both _____ and _____ reproductive organs.
mature proglottids contain both male and female reproductive organs = hermaphroditic.
The parasites considered to be cestodes are:
-Taenia saginata (Beef tapeworm)
-Taenia solium (Pork Tapeworm)
-Hymenolepis nana (Dwarf Tapeworm)
-Hymenolepsis diminuta (Rat Tapeworm)
-Diphyliobothrium latum (Broad fish tapeworm)
-Echinococcus granulosus (Hydatid Tapeworm)
-Dipylidium caninum (Dog tapeworm)
Taenia saginata has a scolex with an _________ rostellum?
Diagnostic stage of Taenia saginata:
-characteristic egg in feces
-proglottids with 15-30 uterine branches
THe proglottids of T. saginata have _____ number of major uterine branches?
15-30 uterine branches
Infection with T. saginata is caused by:
Ingestion of undercooked beef containing larval stage
Taenia solium scolex has a _____ rostellum?
Cysticercosis is caused by which cestode?
Taenia solium

-parasite causing this serious condition must be ARMED.

-found in connective tissue, eye, brain, muscles, heart, lung.
Humans are the _____ host with T. solium?

-Man ingests egg of T. solium
-Egg passes through stomach & hatches in intestine.
-Penetrates mucosa and becomes cysticercus.
The proglottid of T. solium contains ____ major uterine branches?
7-13 major uterine branches

less letters = less uterine branches
Infective stage of T. solium in cysticercosis?

Man is intermediate hose
The most common human tapeworm in the U.S.?
Hymenolepsis nana (Dwarf Tapeworm)

-small tapeworm (40mm long)
-does not require intermediate host (may have intermediate host such as flea or beetle)
Hymenolepsis nana has a _______ rostellum?
Armed with hooks
The infective stage of H. nana is ________
Ingestion of eggs

eggs have polar filament
Hymenolepsis diminuta has ____ as the definitive host?

-man is accidental host via ingestion of infected intermediate arthropod host (grain bettles in pre-cooked cereal)
The infective stage of H. dimunuta?
Ingestion of flea
Hymenolepsis diminuta eggs look similar to H. nana but they _____ polar filaments.
Diphyllobothrium latum scolex consists of _____ longitudinal suctorial grooves (bothria)=spoon shape
Cestode in which uterus in gravid proglottid appears as a rosette?
Diphyllobothrium latum

-May have as many as 3000 proglottids
Parasite that causes megaloblastic anemia?
Diphyllobothrium latum

worm absorbs vitamin B12
Infective stage of D. latum?
Ingestion of larvae in infected undercooked freshwater fish
Diagnostic stage of D. latum?
Eggs or proglottids in feces

may not be seen in floation techniques=operculated eggs sink!
ONLY cestode to produce operculated eggs?
Diphyllobothrium latum

*Egg has small abopercular knob*
A disease caused by drinking water containing infected copepod?

larvae develops in human who is the intermediate host instead of the fish
Intermediate hose of D. latum?
Freshwater fish
The intermediate host of Echinococcus granulosus?

ingest eggs
The definitive host of Echinocccus granulosus?

infected from eating viscera of butchered animals
The infective stage of Echinococcus granulosus?
Man ingests egg (intermediate host)
Adult Echinocuccus granulosus are _____ cm long.
3-6 cm long
The scolex of E. granulosus has an ______ rostellum.
Diagnostic stage of Echinococcus granulosus is ________.
1. Hydatid cysts seen in x-rays or exploratory surgery.

-forms in liver, lungs, brain, and heart.

2. Serological tests (ELISA)
Diphylidium caninum diagnostic stage demonstrates _________ in feces.
Egg packet (5-30 eggs are in a hylaline non-cellular egg sac)

found predominantly in children
Diphylidium caninum normal life cycle?
Cats & Dogs ingest infected fleas containing larvae
The infective stage of Diphlidium caninum?
human (accidental intermediate host)ingests infected flea
Proglottids resemble pumpkin/cucumber seeds when moist and rice grains when dry:
Diphlidium caninum
Disease in which man ingests egg of E. granulosus & becomes intermediate host:
Hydatid disease