Parasitology > Intestinal Cestodes > Flashcards

Intestinal Cestodes Flashcards

(59 cards)

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1
Q

Region of growth in cestodes

A

Neck

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2
Q

Body of the cestode

A

Strobila

  • Proglottids - segments of strobila
  • Anterior part - Contains the essential digestive parts
  • Middle part - Reproductive parts
  • Terminal portion - Gravid eggs
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3
Q

Attachment and anterior part of cestodes

A

Head / Scolex

* Houses the cephalic ganglion

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4
Q

The common name of Diphyllobotrium latum

A

Freshwater Broad fish tapeworm

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5
Q

The common name of Taenia solium

A

Pork tapeworm

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6
Q

The common name of T. saginata

A

Beef tapeworm

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7
Q

The common name of T. asiatica

A

Taiwan taenia

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8
Q

The common name of E. granulosus

A

Hydatid worm

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9
Q

The common name of Dipylidium caninum

A

Dog tapeworm / Double pored tapeworm

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10
Q

The common tapeworm of rats

A

Raillietina garisoni

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11
Q

Chain of egg-producing units

A

Progglotids

> They develop posteriorly from the neck region of the scolex

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12
Q

Cestodes are otherwise known as

A

Tapeworms

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13
Q

Characteristic body of cestodes

A

Ribbonlike

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14
Q

The crown of the scolex

A

Rostellum

* may be armed with hooks/ unarmed

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15
Q

The mature cestode is _ which means it contains both female and male reproductive organs

A

Hermaphroditic

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16
Q

Food is absorbed from the house through the cestode’s _

A

Integument

Outer covering/skin of the organism through diffusion

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17
Q

Oncosphere

A

Larva tapeworm within an embryonic envelope

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18
Q

The infective stage of cestodes

A

Hexacanth embryo / Oncosphere

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19
Q

The largest human tapeworm

A 
Diphyllobothrium latum
(Adults=15 m in length with 3000-4000 proglottids)
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20
Q

Uterine structure of D. latum

A

Rosette-shaped uterine structure

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21
Q

Number of sucking grooves/ bothria in D. latum

A

Two (shallow sucking grooves)

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22
Q

Only cestode to have an aquatic life cycle

A

D. latum

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23
Q

Reservoir host and Definitive host of D. latum

A

Reservoir: fish
Definitive: humans

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24
Q

How many intermediate hosts does D. latum require?

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A

2

1st: Copepods (houses the first larval stage: coracidium and produces procercoid through shedding)
2nd: Fish / Crustaceans (ingests INFECTIVE procercoid larva, and develops to plerocercoid)

25
Infective stage of D. latum
Plerocercoid
26
Difference of coracidium, Procercoid, and plerocercoid
Coracidium: Has epithilium, ciliated, and bears 6 terminal hooks Procercoid: Does not have epithelium (shedded coracidium) Plerocercoid: Ribbonlike organism with an undivided scolex
27
D. latum matures into an adult tapeworm within the human _
Small intestine
28
D. latum eggs are sometimes confused with _ eggs
Paragonimus eggs
29
Cestode infection that is transmitted to humans through the ingestion of dog and cat fleas
Dipylidium caninum
30
Also known as the dwarf tapeworm
Hymenolepis nana
31
Only cestode that requires 2 intermediate hosts
D. latum
32
Identify the parasite: | Cucumber seed appearance/resemblance to a dried grain of rice
Dipylidium caninum
33
Intermediate host of D. caninuum
Intermediate host: Dog/cat flea *Reservoir hosts: humans, cats, dogs
34
Since D. latum proglottids may be shed in the feces, and may stick to the skin around the anal area, they may be misdiagnosed as an infection of _
Enterobius vermicularis * symptoms of D. caninum are also very similar to pinworm infection
35
Infective stage of D. caninum
Cysticercoids
36
Identify: | Patient has an appearance of seedlike particles in the stool and undergarments of the patient
D. caninum
37
The most common tapeworm with worldwide distribution
Hymenolepis nana
38
Cestode infection wherein intermediate host is NOT required, allowing person-to-person spread possible
H. nana
39
Humans are _ host in H. nana infection
Intermediate AND Definitive
40
Refers to a large parasitic burden within the host
Hyperinfection
41
T/F | H. nana is capable of autoinfection and Hyperinfection
TRUE *Autoinfection- constant reproduction of the parasite within the host
42
Difference of nana and diminuta eggs
H. nana eggs are smaller and have 4-8 POLAR FILAMENTS present in the space between the oncosphere and the eggshell
43
Also known as the rat tapeworm
Hymenolepis diminuta
44
Humans are the _ host in T. solium
Definitive & intermediate host | ** presence of both adult and larval stages
45
Intermediate host of T. solium
Pigs
46
Can t. solium invade the CNS?
Yes (severe form)
47
The major complication (patholgy) of T. solium
Cysticercosis
48
T/F: | T. solium and T. saginata can be differentiated on the basis of egg morphology
FALSE. T. solium and T. saginata CANNOT be differentiated on the basis of egg morphology
49
Number of lateral uterine branches in T. saginata and T. solium
T. saginata: >13 uterine branches | T. solium: 7-13 uterine branches
50
Stain for uterine braches
India ink
51
DOC for cestode infections
Praziquantel
52
Cysticerci do not survive temperatures below _ or above _
below -10C | above 50C
53
What is the 3rd taenia spp?
Taenia asiatica
54
D. latum is previously known as _
Dibothriocephalus latus
55
Most common parasitic disease of the CNS
Cysticercosis
56
Longest cestode
T. saginata
57
Smallest cestode
H. nana
58
Shortest cestode
E. granulosus
59
Tapeworm that can cause megaloblastic anemia
D. latum
Parasitology
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