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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

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
Most distal from neck Filled with eggs Testes & ovaries sometimes not seen
Gravid / Ripe Proglottid
23
Detachment of gravid segment from the body
Apolysis
24
For egg shell production
Vitellaria
24
Located in the **medial surface** of the proglottids Opening for eggs to exit from the gravid segment
Uterine Pores
25
Site where male and female organs meet
Genital Pores
26
Describe the Digestive System of Cestodes
N/A
26
T/F Cestodes do not have Digestive & Circulatory System
T
27
Describe the strobila of the False Tapeworm
Anapolytic: Proglottids unable to detach
27
Describe the strobila of the True Tapeworm
Apolytic: Proglottids able to attach
27
Cestodes obtain nutrient via absorption and diffusion through their ________
Tegument
28
Describe the Vitellaria of Order Pseudophyllidea
Diffused with many follicles Dispersed, not compact Found ventrally
29
Describe the Vitellaria of Order Cyclophyllidea
Compact and separate
30
Describe the uterine pore of False & True Tapeworms
True: N/A False: Present in median Ventral Surface
30
T/F All reproductive organs still present in the gravid proglottid of false tapeworm.
F; True Tapeworm
31
Ova of False Tapeworms
Oval Operculated Unembryonated
32
Ova of True Tapeworms
Spherical Nonoperculated Eggs Embryonated
32
Larval Stages of False Tapeworms
Coracidium -> Procercoid (sparganum) -> Plerocercoid
33
Larval Stages of True Tapeworms
Depends per species Cysticercus Cysticercoid Hydatid cyst
33
T/F The coracidium is motile and ciliated.
T
34
Oncosphere of D. caninum and Taenia spp.
Hexacanth embryo (6 hooklets)
35
False Tapeworm Inner Envelope Embryophore Outer Envelope
Inner Envelope: Surround oncosphere Embryophore: Ciliated and surrounds the inner envelope Outer Envelope: Surrounds ciliated embryophore
36
D. caninum: Embryophore Shell
Embryophore: Not ciliated Shell: Outermost
36
Taenia spp. Embryophore Shell
Both striated
37
Pseudophyllidea: Infective stage to humans and causes what?
Plerocercoid (found in fishes) causes Sparganosis
38
Larval invasion, multi-organ infection
Sparganum
39
What is located on distal part of procercoid?
Cercomer

MT 639: PARA (3 decks)

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