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54 Cards in this Set
- Front
- Back
one of the segments of a tapeworm. each contains male and female reproductive organs when mature |
proglottid |
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fleshy protuberance on the anterior end of the scolex. depending on the species, may bear hooks and be retractable. |
rostellum |
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anterior end of a tapeworm. attaches to the intestinal wall using suckers and/or hooks |
scolex |
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entire body of the tapeworm |
strobila |
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entire body surface of platyhelminth. in cestodes, it absorbs nutrients and oxygen and releases wastes |
tegument |
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Adult cestodes live in the ________ of the definitive hosts. |
intestines |
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The larval stage of cestodes lives in the ________ of the intermediate hosts. |
tissues |
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onchosphere, hexacanth |
embryo in cestode egg |
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cestode uterus full of eggs |
gravid proglottid |
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accidental ingestion of cysticercoid larva in dog or cat flea. rare or self limiting infection most often seen in children. adult worm lives in intestine. spontaneous loss of worm is often seen. |
Dog or cat tapeworm. zoonotic infection. Dipylidium caninum |
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Dipylidium caninum egg packet |
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Dipylidium caninum egg packet |
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Broad fish tapeworm |
Diphyllobothrium latum |
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adults can grow up to 20 meters long, may cause vague gastrointestinal distress and obstruction, complex life cycle. multiple intermediate hosts. human infected by eating raw or undercooked freshwater fish with larvae in muscles |
Diphyllobothrium latum |
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Infection connected with macrocytic anemia. Tapeworm uses up to 100% dietary anemia |
Diphyllobothrium latum |
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operculum |
a lid or caplike structure seen in D. latum eggs |
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abopercular |
the end opposite the operculum |
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Diphyllobothrium latum egg |
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Diphyllobothrium latum scolex |
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Diphyllobothrium latum proglottids |
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D. latum egg |
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Echinococcus granulosus |
Hyatid tapeworm |
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seen in sheep raising area. canine definitive hosts. hexacanth embryo forms cyst in tissues |
Echinococcus granulosus |
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ctst rupture may result in death |
Echinococcus granulosus |
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found in the SW among native tribes
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Hyatid tapeworm
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a structure in the daughter cyst in which many scolices grow |
brood capsule |
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granular material from older hyatid cysts thats includes free scolices, daughter cysts, hooklets and amorphous material |
hydatid sand |
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a cyst formed in the intermediate host tissue that contains fluid, brood capsules, and daughter cysts. Grows slowly and can become quite large |
hydatid cyst |
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Echinococcus granulosus egg |
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Echinococcus granulosus egg |
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Echinococcus granulosus adult worm |
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Echinococcus granulosus scolex |
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hydatid cyst |
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rat tapeworm |
Hymenolepsis diminuta |
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human accidentally ingests flea or grain beetle that has larva- mild symptoms, often tapeworm is simultaneously lost |
rat tapeworm. Hymenolepsis diminuta |
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Hymenolepsis diminuta egg |
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dwarf tapeworm |
Hymenolepsis nana |
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no intermediate host. eggs are infective when released. larva matures in intestinal villus, emerges into intestinal lumen, attaches to mucosa. auto reinfection common. |
Hymenolepsis nana. dwarf tapeworm |
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most common tapeworm in the US |
Hymenolepsis nana |
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mice act as secondary host. adult worm 2-4 cm long |
Hymenolepsis nana. dwarf tapeworm |
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Hymenolepsis nana eggs |
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Human infection initiated through ingestion of larva in undercooked beef |
Taenia saginata |
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Human infection initiated through ingestion of larva in undercooked pork |
Taenia solium |
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eggs of the two species are nearly identical- scolex and proglottids must be observed to differentiate |
Taenia saginata and Taenia solium |
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Larvae can develop in human tissue, Humans are the only known definitive hosts |
Taenia species |
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Taenia eggs |
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Beef tapeworm |
Taenia saginata |
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Taenia saginata scolex |
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Taenia saginata proglottid |
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a thin walled fluid filled cyst enclosing a scolex |
cysticercus |
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Taenia solium scolex |
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Taenia solium proglottid |
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Taenia tapeworms |
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pollen artifact |