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Parasitology > Cestodes (generalities + characs) > Flashcards

Cestodes (generalities + characs) Flashcards

1
Q

The cestodes, or tapeworms, constitute the class ____ of the phylum ____.

A

Cestoda; Platyhelminthes

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2
Q

All adult tapeworms have a white body and a ____-like appearance.

eong kalaban ng Goldilocks!

A

ribbon-like

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3
Q

All cestodes are hermaphroditic, otherwise known as ____.

A

monoecious

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4
Q

What do you call the attachment organ in the anterior portion of a tapeworm?

A

scolex

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5
Q

What do you call the portion immediately posterior to the scolex where new segments continuously grow?

A

neck

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6
Q

What do you call the segments of a tapeworm that grows from the neck?

A

proglottids

also known as strobila

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7
Q

The new segments are referred to as ____ because they do not yet contain fully developed internal structures.

A

immature

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8
Q

The ____ segments are larger and are found near the middle of the chain, and may contain set/s of reproductive organs.

A

mature

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9
Q

The terminal portion of the strobila contains the ____ segments, usually filled with eggs.

A

gravid

or ripe

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10
Q

In the adult worm of cestodes, the eggs are enclosed in the ____, a structure that varies in shape and size and serves as an important diagnostic feature.

A

uterus

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11
Q

Terminal proglottids may become detached in the intestine and pass out with the stool in a process called ____.

A

apolysis

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12
Q

All tapeworms inhabit the ____, where they live attached to the mucosa.

A

small intestine

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13
Q

Tapeworms do not have a digestive system. Instead, nutrients are absorbed from the host’s intestine through the ____.

A

tegument

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14
Q

The tapeworms are classified into two orders, order ____ and order ____.

vid on orders

A
  • Order Pseudophyllidea
  • Order Cyclophyllidea

False & True tapeworm

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15
Q

All cestodes have four muscular, cuplike suckers on the scolex except the tapeworms from what order?

A

order Pseudophyllidea

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16
Q

Cestodes under the order Pseudophyllidea possess a scolex bearing grooves called ____ instead of suckers.

A

bothria

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17
Q

The scolex may have an elongate and protrusible structure called ____ that is situated in the center of the scolex.

A

rostellum

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18
Q

Depending on whether hooks are present or not, the crown of scolex may be ____ or ____.

A

armed or unarmed

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19
Q

In general, cestodes’ extraintestinal infection with the ____ forms is a much more serious matter than infection with the adult worm.

A

larval

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20
Q

What are the three shapes (kinds) a scolex may have?

A
  • Quadrate
  • Globular
  • Spoon-like
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21
Q

Identify the order of tapeworm being described

Dibothriocephalus latus is a member

A

Order Pseudophyllidea

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22
Q

Identify the order of tapeworm being described

Scolex is/has:
- Spoonlike, almond-shaped, spatulate
- 2 slitlike grooves called bothria
- No rostellum and no hooks

A

Order Pseudophyllidea

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23
Q

Identify the order of tapeworm being described

Scolex is/may:

  • Quadrate
  • possess rostellum
  • possess 4 cuplike suckers
A

Order Cyclophyllidea

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24
Q

Identify the order of tapeworm being described

Its strobila is Anapolytic

A

Order Pseudophyllidea

25
Q

Identify the order of tapeworm being described

Its strobila is Apolytic

A

Order Cyclophyllidea

26
Q

Identify the order of tapeworm being described

The gravid proglottid has:
- all reproductive organs still present
- a rosette uterus

A

Order Pseudophyllidea

27
Q

Identify the order of tapeworm being described

The gravid proglottid has:
- degenerate reproductive organs
- only the uterus and its lateral branches are seen

A

Order Cyclophyllidea

28
Q

Identify the order of tapeworm being described

The uterine pore is present and located on the median ventral surface

A

Order Pseudophyllidea

29
Q

Identify the order of tapeworm being described

The uterine pore is absent

A

Order Cyclophyllidea

30
Q

Identify the order of tapeworm being described

The ova may be described as:

  • Oval
  • Operculated
  • Unembryonated
A

Order Pseudophyllidea

31
Q

Identify the order of tapeworm being described

The ova may be described as:
- Spherical
- Non-operculated
- Embryonated

A

Order Cyclophyllidea

32
Q

Identify the order of tapeworm being described

The larval stages present are:

  • Coracidium
  • Procercoid
  • Plerocercoid
A

Order Pseudophyllidea

33
Q

Identify the order of tapeworm being described

The larval stages present are:

  • Cysticercus
  • Cysticercoid
  • Hydatid cyst
A

Order Cyclophyllidea

34
Q

Identify the order of tapeworm being described

Has 2 intermediate hosts namely:
- crustaceans/copepods
- freshwater fishes

A

Order Pseudophyllidea

35
Q

Identify the order of tapeworm being described

Has 1 intermediate host: lower animal forms, man

some do not require intermediate hosts

A

Order Cyclophyllidea

36
Q

What is the former name of Dibothriocephalus latus?

A

Diphyllobothrium latum

37
Q

Although infection of Dibothriocephalus latus is relatively harmless, it may produce a condition called ____ due to the selective absorption of vitamin B12 from the intestines.

A

pernicious anemia

which leads to erythropoiesis impairment then macrocyte production

38
Q

What do you call the embryo that the membranes of a tapeworm egg protect?

A

oncosphere

usually described as hexacanth embryo

hexacanth = hexa = 6 small hooks (hooklets) r present (3 pairs)

39
Q

largest tapeworm of man?

A

Dibothriocephalus latus

40
Q

Some cestode species utilize humans only as definitive hosts, growing to adulthood in the intestine after the ingestion of infective larva. What are these spp.?

A
  • Dibothriocephalus latus
  • Taenia saginata
  • Hymenolepis diminuta
41
Q

Some cestode species utilize humans as both the definitive or intermediate hosts. What are these spp.?

A
  • Taenia solium
  • Hymenolepis nana
42
Q

Other cestode spp, such as ____, utilize humans as one of their possible intermediate host but never as the definitive host.

A

Echinococcus

43
Q

Which of the cestodes consider man as an accidental host?

A
  • Dipylidium caninum
  • Hymenolepis spp.
  • Echinococcus spp.
44
Q

Which of the cestodes have their gravid segments wider than longer?

A

Dibothriocephalus latus

45
Q

Which of the cestodes have their mature segments wider than longer?

A
  • Dibothriocephalus latus
  • Taenia solium
  • Taenia saginata
46
Q

Which of the cestodes have all segments wider than longer?

A
  • Hymenolepis nana
  • Hymenolepis diminuta
47
Q

Which of the cestodes have its mature and gravid proglottid longer than wide?

A

Dipylidium caninum

48
Q

True or False

The embryonated egg of beef tapeworm is the infective stage to humans

A

False

IS is larva: Cysticercus bovis

49
Q

True or False

The eggs of Taenia solium and Taenia saginata is indistinguishable from each other.

A

True

50
Q

True or False

Taenia solium adult is longer than Dibothriocephalus latus adult

A

False

longest tapeworm si D. latus

51
Q

What is the infective stage of rat tapeworm?

A

Cysticercoid larva

rat tapeworm = Hymenolepis diminuta

52
Q

What is the scientific name of the only tapeworm that may or may not require an intermediate host?

A

Hymenolepis nana

53
Q

True or False

Taenia solium egg is the infective stage to humans?

A

True

but book said na egg is an infective stage

but ma’am said na false daw (but buk)

54
Q

What do you call the intradermal test to diagnose Hydatid disease?

A

Casoni Intradermal Test

55
Q

Polar filaments is diagnostic to what tapeworm?

A

Hymenolepis nana

56
Q

Presence of two genital pores in a proglottid is a diagnostic feature of what tapeworm?

A

Dipylidium caninum

57
Q

What is the scientific name of the only tapeworm with operculated eggs?

A

Dibothriocephalus latus

58
Q

True or False

Hydatid disease is seen in Hymenolepis diminuta

A

False

Parasitology (25 decks)

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