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CESTODES Flashcards

1
Q

Multicellular worms noted for their flat or ribbon-like appearance.

A

CESTODES

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2
Q

the cestode body consists of an _____, or ____, followed by a chain of segments, _______.

A

anterior attachment organ, scolex, proglottids (strobila)

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3
Q

do not have a digestive system

A

CESTODES

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4
Q

all cestodes of humans have four muscular, cup-shaped suckers on the scolex except

A

D. latum

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5
Q

Self-fertilizing

A

hermaphroditic

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5
Q

a ___may have an elongate and protrusible structure, the _____, situated in the center of the scolex

A

scolex , rostellum (hooks or armed)

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6
Q

Sexes are not separated.

A

CESTODES

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6
Q

cestode life cycle

A

egg, one or more larval stages, and adult worm

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7
Q

has presence of six small hooks (called hooklets)

A

hexacanth embryo (oncosphere)

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8
Q

resemble a ribbon in appearance and range in length from several millimeters up to an impressive 15 to 20 m.

A

Adult tapeworms

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8
Q

These worms are very primitive in that they absorb nutrients and excrete waste products through their outer surface, called a

A

tegument

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9
Q

THREE DISTINCT FEATURES

A
  1. Scolex (anterior end)
  2. neck region
  3. series of proglottids (strobila)
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10
Q

Radial striations on yellow-brown embryophore, three pairs of hooklets, hexacanth embryo

A

Taena spp egg

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11
Q

T. solium rostellum

A

present

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12
Q

T. saginata number of suckers

A

4

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13
Q

T. solium number of suckers

A

4

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14
Q

T. saginata rostellum

A

absent

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15
Q

T. saginata hooks

A

absent

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15
Q

T. solium hooks

A

present; double crown

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16
Q

T. saginata gravid proglottid apearance

A

longer than wide; average

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17
Q

T. solium gravid proglottid apearance

A

somewhat square

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18
Q

T. saginata number of lateral branches on each side of uterus

A

15-30

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18
Q

T. solium number of lateral branches on each side of uterus

A

7-15

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19
Q

Taenia spp laboratory diagnosis

A
  • Stool is the specimen of choice (eggs and gravid proglottids).
  • Cellophane tape prep procedures result in a very high recovery rate of Taenia eggs.
  • Eggs of Taenia are identical
    The Gravid proglottid or scolex must be recovered and examined (Speciation purpose).
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20
HYMENOLEPIS DIMINUTA Egg hooklets
three pairs; hexacanth embryo
21
HYMENOLEPIS DIMINUTA Egg polar thickenings
present
22
HYMENOLEPIS DIMINUTA Egg polar filaments
absent
23
HYMENOLEPIS DIMINUTA adult number of suckers
four
23
HYMENOLEPIS DIMINUTA egg embryophore
present; colorless
24
HYMENOLEPIS DIMINUTA adult rostellum
present
25
HYMENOLEPIS DIMINUTA adult hooks
absent
25
HYMENOLEPIS DIMINUTA laboratory diagnosis
* recovery of the characteristic eggs in stool specimens. * note that the proglottids are typically not found in stool because they usually disintegrate in the human gut. * scolex is rarely seen in these samples.
26
HYMENOLEPIS DIMINUTA adult gravid proglottid appearance
sac-like uterus filled with eggs
26
HYMENOLEPIS DIMINUTA gravid proglottid size
twice as wide as long
27
proglottids are typically not found in stool because they usually disintegrate in the human gut.
HYMENOLEPIS DIMINUTA
27
filaments emerge from polar thickenings, colorless embryophore (shell), hexacanth embryo, three pairs of hooklets
HYMENOLEPIS NANA
28
scolex is rarely seen in these samples
HYMENOLEPIS DIMINUTA
29
HYMENOLEPIS NANA Egg hooklets
three pairs; hexacanth embryo
30
HYMENOLEPIS NANA Egg polar thickenings
present
31
HYMENOLEPIS NANA Egg polar filaments
present
32
HYMENOLEPIS NANA Egg embryophore
present; colorless
33
HYMENOLEPIS NANA ADULT number of suckers
four
33
HYMENOLEPIS NANA ADULT rostellum
present; short
34
HYMENOLEPIS NANA ADULT hooks
present; one row
35
HYMENOLEPIS NANA ADULT gravid proglottid size
twice as wide as long
36
HYMENOLEPIS NANA ADULT gravid proglottid appearance
sac-like uterus filled with eggs
37
HYMENOLEPIS NANA laboratory diagnosis
Accomplished by examining stool samples
38
Dipylidium caninum Egg Packet number of eggs in enclosed packet
5-30
39
Dipylidium caninum Egg Packet diameter range per egg
30-60 um
39
Dipylidium caninum Adult number of suckers
4
39
Dipylidium caninum Egg Packet individual egg features
six hooked oncosphere
40
Dipylidium caninum Adult rostellum
present; club shaped, with one to seven circlets of spines
41
Dipylidium caninum Adult hooks
absent
42
Dipylidium caninum Adult gravid proglottid shape
pumpkin seed
43
Dipylidium caninum Adult gravid proglottid appearance
full of eggs in enclosed embryonic membrane
44
Dipylidium caninum laboratory diagnosis
Recovery of the characteristic egg packets or gravid proglottids in stool samples
45
Diphyllobothrium latum Egg shape
somewhat oblong
46
Diphyllobothrium latum Egg embryo
undeveloped, termed coracidium
47
Diphyllobothrium latum Egg shell
smooth, yellow brown in color
48
Diphyllobothrium latum Egg other features
operculum on one end; terminal knob on opposite end
49
terminal knob, operculum, coracidium (undeveloped embryo)
Diphyllobothrium latum
50
Diphyllobothrium latum adult number of sucking grooves
two
51
Diphyllobothrium latum adult shape of sucking groove
almond
52
Diphyllobothrium latum adult gravid proglottid shape
wider than long
53
ECHINOCOCCUS GRANULOSUS Hyatid cyst protective coverings
cyst wall; multiple laminated Germinal tissue layers
54
Diphyllobothrium latum adult gravid proglottid location and appearance of uterine structure
central; rosette
55
INTESTINAL-EXTRAINTESTINAL CESTODES
ECHINOCOCCUS GRANULOSUS
55
Diphyllobothrium latum laboratory diagnosis
Examining stool specimens for the presence of the characteristic eggs and/or, less frequently, the proglottids.
56
ECHINOCOCCUS GRANULOSUS Hyatid cyst basic cyst makeup
fluid filled bladder
57
Serologic tests such as ___, indirect ___, and the_____ are available.
ELISA, hemagglutination, Western blot test
57
ECHINOCOCCUS GRANULOSUS Hyatid cyst structure that arise
daughter cyst
57
ECHINOCOCCUS GRANULOSUS Hyatid cyst other possible structures present
hyatid sand
58
ECHINOCOCCUS GRANULOSUS Hyatid cyst from inner Germinal layer
brood capsules
58
Detection of the hydatid cyst may be accomplished using ____, _____, or ____.
radiography, computed tomography (CT), ultrasound scan techniques
59
ECHINOCOCCUS GRANULOSUS LABORATORY DIAGNOSIS
* Hydatid cyst fluid may be examined on biopsy samples for the presence of scolices, daughter cysts, brood capsules, or hydatid sand. * Serologic tests such as ELISA, indirect hemagglutination, and the Western blot test are available. * Detection of the hydatid cyst may be accomplished using radiography, computed tomography (CT), or ultrasound scan techniques.
60
Hydatid cyst fluid may be examined on ____ for the presence of scolices, daughter cysts, brood capsules, or hydatid sand.
biopsy samples
61

PARASITOLOGY LAB (2 decks)

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