Cestodes - Exam 3

Question 1

cestodes common name

Answer 1

tapeworms (fleas)

Question 2

structure

Answer 2

flat body, segmented, fettuccine, without body cavity, strobili (body), with head, neck, proglottids (segments), head: scolex with 4 suckers or bothria, no alimentary canal (nutrients absorbed through cuticle)

Question 3

hermaphrodite

Answer 3

each proglottid- M & F independent, ends are sexually mature & break off, eggs released through genital pore

Question 4

indirect life cycle

Answer 4

IH- larval, FH- adult

Question 5

several types of larval stage but

Answer 5

each cestode species only 1 larval stage

Question 6

oncosphere

Answer 6

contains egg, released

Question 7

taenia solium

Answer 7

scolex, adult in final host, segments in feces, eggs released from proglottids, eggs consumed by IH (pig), consumed by FH (human), adults not a problem but larvae are

Question 8

hexacanth embryo

Answer 8

inside oncosphere, what you see in fecals

Question 9

hexacanth embryo & oncosphere

Answer 9

consumed by IH, forms larvae, purpose: to make a scolex

Question 10

dipylidium caninum

Answer 10

egg packets released, “bony fingers”, several types of larvae but only one type occurs for each species

Question 11

taenia saginata cysticercus

Answer 11

“pearls” in pork

Question 12

hydatid cysts- echinococcus spp

Answer 12

cyst within a cyst, scolex inside that