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MT 639: PARA > CESTODES GENERALITIES > Flashcards

CESTODES GENERALITIES Flashcards

1
Q

Cestodes Taxonomy

A

Phylum Platyhelminthes
Class Cestoda

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2
Q

Common Name of Cestodes

A

Tapeworms

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3
Q

Cestode: Type of Parasite

A

Monoecious / Hermaphroditic

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4
Q

Cestode General Appearance

A

Flat, Tape / Ribbon-like appearance and Segmented

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4
Q

Habitat of Tapeworms

A

Small Intestine

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5
Q

Tegument:

Give its functions
Glycoalyx
Proximal
Distal

A

Glycoalyx:
- Carbohydrate-rich - for protection
- Microthrices - for absorption
Proximal - Muscles of tegument
Distal - Has mitochondria

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6
Q

Eggs of Cyclophyllidea

A

Embryonated
Non-operculated

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7
Q

D. latus egg

A

Operculated
Unembryonated

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8
Q

Function of Scolex

A

Attachment organ / Holdfast organ (Attach to the small intestine)

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9
Q

2 Types of Scolex

A

Acetabulate & Bothriate

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10
Q

4 Cup-like suckers
(2 in front, 2 at the back)
Aid in attachment
Found in true tapeworms

A

Acetabulate

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11
Q

Slit-like groove or depression
Spoon, spatulate,
almond-shaped

A

Bothriate

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12
Q

How many bothriate does D. latus have?

A

2, hence DIBOTHriocephalus

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13
Q

Crown of scolex
Protruding structure where hooks are attached

A

Rostellum

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14
Q

Has hooks / hooklets

A

Armed Rostellum

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14
Q

No hooks

A

Unarmed Rostellum

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15
Q

T/F:

Not all tapeworms have rostellum

A

T

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16
Q

Region of growth and where proglottids arise

A

Neck

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17
Q

Tapeworm segments / Chain of Segments

A

Proglottids

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18
Q

Process of formation of proglottids

A

Strobilization

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19
Q

Strobila

A

1 segment

20
Q

Most proximal
Still developing
No reproductive structures

A

Immature Proglottid

21
Q

What are the reproductive structures seen in Mature Proglottid?

A

1) Uterus
2) Ovaries
3) Testes
4) Vitellaria
5) Vas deferens

21
Q

Well-developed reproductive structures

A

Mature Proglottid

22
Q

Most distal from neck
Filled with eggs
Testes & ovaries sometimes not seen

A

Gravid / Ripe Proglottid

23
Q

Detachment of gravid
segment from the body

A

Apolysis

24
Q

For egg shell production

A

Vitellaria

24
Q

Located in the medial surface of the proglottids
Opening for eggs to exit from the gravid segment

A

Uterine Pores

25
Q

Site where male and female organs meet

A

Genital Pores

26
Q

Describe the Digestive System of Cestodes

A

N/A

26
Q

T/F

Cestodes do not have Digestive & Circulatory System

A

T

27
Q

Describe the strobila of the False Tapeworm

A

Anapolytic: Proglottids unable to detach

27
Q

Describe the strobila of the True Tapeworm

A

Apolytic: Proglottids able to attach

27
Q

Cestodes obtain nutrient via absorption and diffusion through their ________

A

Tegument

28
Q

Describe the Vitellaria of Order Pseudophyllidea

A

Diffused with many follicles
Dispersed, not compact
Found ventrally

29
Q

Describe the Vitellaria of Order Cyclophyllidea

A

Compact and separate

30
Q

Describe the uterine pore of False & True Tapeworms

A

True: N/A
False: Present in median Ventral Surface

30
Q

T/F

All reproductive organs still present in the gravid proglottid of false tapeworm.

A

F; True Tapeworm

31
Q

Ova of False Tapeworms

A

Oval
Operculated
Unembryonated

32
Q

Ova of True Tapeworms

A

Spherical
Nonoperculated
Eggs Embryonated

32
Q

Larval Stages of False Tapeworms

A

Coracidium -> Procercoid (sparganum) -> Plerocercoid

33
Q

Larval Stages of True Tapeworms

A

Depends per species

Cysticercus
Cysticercoid
Hydatid cyst

33
Q

T/F

The coracidium is motile and ciliated.

A

T

34
Q

Oncosphere of D. caninum and Taenia spp.

A

Hexacanth embryo (6 hooklets)

35
Q

False Tapeworm

Inner Envelope
Embryophore
Outer Envelope

A

Inner Envelope: Surround oncosphere
Embryophore: Ciliated and surrounds the inner envelope
Outer Envelope: Surrounds ciliated embryophore

36
Q

D. caninum:

Embryophore
Shell

A

Embryophore: Not ciliated
Shell: Outermost

36
Q

Taenia spp.

Embryophore
Shell

A

Both striated

37
Q

Pseudophyllidea:

Infective stage to humans and causes what?

A

Plerocercoid (found in fishes) causes Sparganosis

38
Q

Larval invasion, multi-organ infection

A

Sparganum

39
Q

What is located on distal
part of procercoid?

A

Cercomer

MT 639: PARA (3 decks)

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