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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
What is the intermediate host of Taenia saginata
Cattle
25
What is the meta-cestode version of Taenia saginata
Cysticercus bovis
26
Where is Cysticercus bovis found
Skeletal and heart muscle. Contracted from poorly cooked meat
27
What is the definitive host for echinococcus multiculocularis
Canines. Humans are incidental hosts
28
What is the intermediate host for echinococcus multiculocularis
Rodents
29
What is echinococcus multiculocularis considered
A zoonotic disease
30
What is cotyloda
Flat, ribbonlike, segmented pseudo tapeworms processing a scolex. Have a bothria
31
What is a bothria
Long sticky slit
32
How do cotyloda get their nutrients
Through the skin
33
Do cotyloda have proglottids
Yes and they are hermaphroditic. Their eggs are operculated unlike eucestodes
34
What happens when operculated cotyloda eggs go into the environment
They hatch with contact of water. The coracidium is released from egg
35
What is a coracidium
Hexacanth embryo
36
Who is the first intermediate host of cotyloda
Aquatic crustacean called copepod
37
What happens to the coracidium inside of the copepod
It develops into a procircoid
38
Who is the second intermediate host of cotyloda
A fish. Develops into a Plarocircoid
39
How does the plarocircoid reach the definitive host
It is ingested by the fish. And develops into a sexually mature form of the tapeworm
40
What is dipylidium caninum
The cucumber seed tapeworm.
41
What is the intermediate host of the dipylidium caninum
The flea. Every metacestode ingested will become an adult tapeworm
42
What is the PPP for dipylidium caninum
14 to 21 days.
43
How do you diagnose dipylidium caninum
Fecal or visualization of proglottid
44
How do you treat dipylidium caninum
Parasite and flea killer.
45
Is dipylidium caninum zoonotic
Yes
46
What is the intermediate hosts for Taenia pisiformis, hydatigena, Ovis
Rabbits, hares (pisiformis), ruminants (hydatigena), sheep (Ovis)
47
How does a dog get Taenia pisiformis, hydatigena, Ovis
Must ingest intermediate host. Infectious cysts are in greater omentum or abdominal organs. Generally from uncooked lamb in raw diet
48
What is Taenia taeniaformis
The feline tapeworm
49
What are the intermediate hosts of Taenia taeniaformis
Mice, rabbits, rat
50
How do cats get Taenia taeniaformis
By ingesting intermediate host
51
Describe echinococcus granulosis and multilocularis
Tiniest veterinary cestodes. Very small proglottids. Highly zoonotic. Mimics cancer
52
What is the intermediate host for echinococcus granulosis
Sheep, cattle, herbivores
53
What is the intermediate host for multilocularis
Rats mice and voles
54
What do echinococcus granulosis and multilocularis cause in the body
Hydatid cysts in the brain, liver, lungs
55
What is diphyllobothrium Latum
Giant fish tapeworm.
56
Who is the definitive host for diphyllobothrium Latum
Cats, dogs, humans
57
What is the first intermediate host of diphyllobothrium Latum
Aquatic crustacean
58
What is the Second intermediate host of diphyllobothrium Latum
Fish. Causes a Plerocercoid in muscle
59
Is a parasite absorbs vitamin B 12 what does it cause
Anemia
60
What is spirometra
Zipper tapeworm in small intestine
61
Why is Spirometra called a zipper tapeworm
It unzips and releases its eggs
62
What is the first intermediate host for the Spirometra
Crustacean
63
What is the second intermediate host for the Spirometra
Fish or frogs.

Parasitology (9 decks)

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