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Parasitology > Cestodes > Flashcards

Cestodes Flashcards

0
Q

What are cestodes referred to as

A

Tapeworm

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1
Q

What phylum and class are cestodes in

A 
Phylum platyhelminth, 
class Cestoda
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2
Q

Describe the general shape of cestodes

A

Flattened dorsal ventrally, ribbonlike and segmented, containing segments called proglottids

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3
Q

Describe the morphology of eucestodes

A

Has a scolex at the anterior end. Some have acetabula and Rostellum

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4
Q

What is a scolex

A

A head

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5
Q

What is a acetabula

A

Suckers

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6
Q

What is a Rostellum

A

Spiky head

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7
Q

If a cestode has a Rostellum what do you consider him

A

Armed

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8
Q

If I cestode does not have a rostellum what do you consider him

A

Unarmed

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9
Q

What is very special about eucestodes and how they intake food

A

They have no digestive track. They intake their food through the skin

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10
Q

What can we say about the proglottids that are close to the scolex

A

They are young proglottids

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11
Q

What can we say about the proglottids that are mid-distance from scolex

A

They are more mature

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12
Q

What can we say about the proglottids that are furthest from the scolex

A

They’re mature and gravid

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13
Q

What is cross fertilization when it comes to eucestodes

A

One proglottid fertilizes with another proglottid

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14
Q

What is self fertilization when it comes to proglottids

A

They fertilize themselves

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15
Q

What is special about eucestodes in terms of sexual reproduction

A

They are hermaphroditic.

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16
Q

What can be said about a gravid proglottid and it’s reproductive organs

A

The reproductive organs have degenerated and only the uterus remains with the eggs inside

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17
Q

Describe a proglottid egg

A

It is a six hooked hexacanth. It is born with all of its hooks already

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18
Q

Describe to eucestode life cycle

A

Gravid proglottids are expelled. Proglottids rupture and release eggs. Ingested by an obligate intermediate host where it develops into a metacestode (6 different forms possible)

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19
Q

What happens if a eucestode is eaten by a flea

A

It becomes a cysticercoid

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20
Q

What happens if the eucestode is eaten by a mama

A

Becomes a cysticercus, coenurus, hydatid cyst

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21
Q

Where do eucestodes live

A

In the digestive tract

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22
Q

How do definitive host become infected with eucestodes

A

It’s the intermediate host at the metacestode stage

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23
Q

What is the definitive host for taenia saginata

A

Human

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24
Q

What is the intermediate host of Taenia saginata

A

Cattle

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25
Q

What is the meta-cestode version of Taenia saginata

A

Cysticercus bovis

26
Q

Where is Cysticercus bovis found

A

Skeletal and heart muscle. Contracted from poorly cooked meat

27
Q

What is the definitive host for echinococcus multiculocularis

A

Canines. Humans are incidental hosts

28
Q

What is the intermediate host for echinococcus multiculocularis

29
Q

What is echinococcus multiculocularis considered

A

A zoonotic disease

30
Q

What is cotyloda

A

Flat, ribbonlike, segmented pseudo tapeworms processing a scolex. Have a bothria

31
Q

What is a bothria

A

Long sticky slit

32
Q

How do cotyloda get their nutrients

A

Through the skin

33
Q

Do cotyloda have proglottids

A

Yes and they are hermaphroditic. Their eggs are operculated unlike eucestodes

34
Q

What happens when operculated cotyloda eggs go into the environment

A

They hatch with contact of water. The coracidium is released from egg

35
Q

What is a coracidium

A

Hexacanth embryo

36
Q

Who is the first intermediate host of cotyloda

A

Aquatic crustacean called copepod

37
Q

What happens to the coracidium inside of the copepod

A

It develops into a procircoid

38
Q

Who is the second intermediate host of cotyloda

A

A fish. Develops into a Plarocircoid

39
Q

How does the plarocircoid reach the definitive host

A

It is ingested by the fish. And develops into a sexually mature form of the tapeworm

40
Q

What is dipylidium caninum

A

The cucumber seed tapeworm.

41
Q

What is the intermediate host of the dipylidium caninum

A

The flea. Every metacestode ingested will become an adult tapeworm

42
Q

What is the PPP for dipylidium caninum

A

14 to 21 days.

43
Q

How do you diagnose dipylidium caninum

A

Fecal or visualization of proglottid

44
Q

How do you treat dipylidium caninum

A

Parasite and flea killer.

45
Q

Is dipylidium caninum zoonotic

46
Q

What is the intermediate hosts for Taenia pisiformis, hydatigena, Ovis

A

Rabbits, hares (pisiformis), ruminants (hydatigena), sheep (Ovis)

47
Q

How does a dog get Taenia pisiformis, hydatigena, Ovis

A

Must ingest intermediate host. Infectious cysts are in greater omentum or abdominal organs. Generally from uncooked lamb in raw diet

48
Q

What is Taenia taeniaformis

A

The feline tapeworm

49
Q

What are the intermediate hosts of Taenia taeniaformis

A

Mice, rabbits, rat

50
Q

How do cats get Taenia taeniaformis

A

By ingesting intermediate host

51
Q

Describe echinococcus granulosis and multilocularis

A

Tiniest veterinary cestodes. Very small proglottids. Highly zoonotic. Mimics cancer

52
Q

What is the intermediate host for echinococcus granulosis

A

Sheep, cattle, herbivores

53
Q

What is the intermediate host for multilocularis

A

Rats mice and voles

54
Q

What do echinococcus granulosis and multilocularis cause in the body

A

Hydatid cysts in the brain, liver, lungs

55
Q

What is diphyllobothrium Latum

A

Giant fish tapeworm.

56
Q

Who is the definitive host for diphyllobothrium Latum

A

Cats, dogs, humans

57
Q

What is the first intermediate host of diphyllobothrium Latum

A

Aquatic crustacean

58
Q

What is the Second intermediate host of diphyllobothrium Latum

A

Fish. Causes a Plerocercoid in muscle

59
Q

Is a parasite absorbs vitamin B 12 what does it cause

60
Q

What is spirometra

A

Zipper tapeworm in small intestine

61
Q

Why is Spirometra called a zipper tapeworm

A

It unzips and releases its eggs

62
Q

What is the first intermediate host for the Spirometra

A

Crustacean

63
Q

What is the second intermediate host for the Spirometra

A

Fish or frogs.

Parasitology (9 decks)

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