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Para Lec > Cestodes > Flashcards

Cestodes Flashcards

1
Q

what is the common name for cestodes?

A

flatworms

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2
Q

what are the characteristics of cestodes?

A

dorse-ventrally flat with bilateral asymmetry

hemaphrodites

does not posses digestive and circulatory system rely on teguments

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3
Q

what attributes to the pathogenicity of cestodes?

A

mechanical obstruction
tissue margination
pyogenic actions
toxic action

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4
Q

what are the parts of the cestodes?

A

scolex
neck
proglottids (strobila)

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5
Q

Contains suckers and hooks for attaching to the host

contains the brain

A

Scolex

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6
Q

what is the composition of cyclophyllidea?

A

rostellum and acetabula

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7
Q

what is the composition of pseudophyllidea?

A

brothria

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8
Q

It is where growth occurs

A

Neck

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9
Q

it grows throughout the life of the tapeworm

A

Proglottid/Strobila

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10
Q

the number of strobila varies with what?

A

size of the worm

age of the host

host-parasite compatibility harmful effects on the host

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11
Q

what are the conditions that cause avulsion on strobila

A

intoxication
starvation
increased persitalsis

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12
Q

what parasite is the largest?

A

Diphyllobothrium latum

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13
Q

what is the larva of Taenia solium

A

cysticercus cellulosae

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14
Q

does Taenia saginata have hooks?

A

no

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15
Q

how many gravid proglottids does Taenia solium have

A

7 to 13

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16
Q

what parasite has 2 polar thickenings but no filaments?

A

Hymenolepsis diminuta

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17
Q

how many polar filaments does Hymenolepsis nana have

A

4 to 8

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18
Q

what is the shortest tapeworm

A

Echinococcus granulosus

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19
Q

what are the 3 laboratory diagnosis for Echinococcus granulosus?

A

exploratory cyst pyncture

roentgenogram (xray)

immunologic test (bentonite flocculation test, casoni intradermal test)

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20
Q

what parasite resemble a melon seed in gravid or mature proglottid

A

Dipyllidium caninum

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21
Q

how many proglottids does Taenia solium have

A

less than 1000

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22
Q

what is the pathogenesis of Taenia saginata

A

obstruction

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23
Q

what are the larval stages of pseudophyllidea

A

Coracidium

Procercoid

Pleurocercoid

24
Q

what are the larval stages of cyclophyllidea

A

cysticercoid

cysticercus

hydatid

25
Q

the rostellum of pseudophyllidea has hooklets T/F

A

false

26
Q

what is the infective stage of Diphyllobothrium latum

A

1st: copepods, 2nd: fresh water fish

27
Q

how many gravid proglottids does Taenia saginata have

A

15 to 20

28
Q

what is the intermediate host of Taenia saginata

A

cattle

29
Q

what is the other name of Taenia asiatica

A

taiwan taenia

30
Q

what is the infective stage of Hymenolepsis nana

A

egg or cysticercoid larva

31
Q

what is the infective stage of echinococcus granulosus

A

hydatid cyst

32
Q

how many segments does the shortest tapeworm have?

A

3

33
Q

what shape is the scolex of diphyllobothrium latum

A

almond shaped

34
Q

It is the region of cestode growth.

A

Neck

35
Q

It is also known as the chain of segments.

A

Strobila

36
Q

What are the three (3) types of segments?

A

MATURE
IMMATURE
GRAVID

37
Q

It is the segment full of eggs.

A

Gravid

38
Q

Cestodes characterized by rostellum with absent hooklets

A

Pseudophyllidea

39
Q

What is an APOLYTIC strobila?

A

Gravid proglottids detach to release eggs

40
Q

What is an ANAPOLYTIC strobila?

A

Gravid proglottids release eggs through the uterine pore

41
Q

What are the larval stages of a true tapeworm?

A

CYSTICERCOID
CYSTICERCUS
HYDATID

42
Q

How do cestodes obtain nutrients?

A

absorption through the teguments

43
Q

It is the largest tapeworm found in man.

A

Diphyllobothrium latum

44
Q

Typical of a Pseudophyllidea, the hexacanth embryo is sheathed in a ciliated embryophore and is called ____________.

A

Coracidium

45
Q

What is the infective stage of D. latum?

A

Plerocercoids

46
Q

What type of anemia can be attributed to D. latum infection?

A

Vitamin B12 (Cobalamin) Deficiency

47
Q

What is the only known natural definitive host of Taenia spp.?

A

Humans

48
Q

The armed scolex causes irritation in the intestinal mucosa.

True or False?

A

True

49
Q

What is the greatest hazard of Taenia spp. to man?

A

Human cysticercosis

50
Q

This cestode is known as the dwarf tapeworm of mice and human.

A

Hymenolepis nana

51
Q

Cestode with conical, retractile rostellum with many rows of small spines.

A

Dipylidium caninum

52
Q

Difference of H. nana and H. diminuta ova?

A

H. nana – with filaments

H. diminuta – without filaments

53
Q

Infective stage of Hymenolepis diminuta

A

Cysticercoid larva

54
Q

Infective stage of Echinococcus granulosus

A

Hydatid cyst

55
Q

Characterized by pumpkin seed appearance of the ova

A

Dipylidium caninum

56
Q

The asexual process of forming segments.

A

Strobilation

57
Q

Order of cestode which has operculated egg.

A

Pseudophyllidean

Para Lec (2 decks)

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