Cestodes Flashcards
Describe cestodes: (4)
- Segmented/ribbon-like
- All hermaphrodites
- Heteroxenous except for H. nana
- Causes intestinal and/or tissue infections
Parts of tapeworms: (5)
Scolex
Neck
Suckers
Hooks
Proglottids
Holdfast organ
Scolex
Scolex of pseudophyllidea
2 bothria
Scolex of cyclophillidea
4 acetabula
Successful treatment from cestodes
Recovery of scolex and neck
Shortest cestode and its number of proglottids
Echinococcus granulosus (3 segments)
Largest cestode and its number of proglottids
Diphyllobothrium latum (3000 segments)
3 important proglottids
- Immature
- Mature
- Gravid
Proglottid that is sexually underdeveloped
Immature proglottids
Proglottid that has complete set of reproductive structure but no eggs are present
Mature proglottids
Proglottid that has presence of uterus filled with eggs
Gravid proglottids
Classification of gravid segments: (4)
Apolytic
Anapolytic
Craspedote
Acraspedote
Segments lyse/rupture to release egg
Apolytic
Segments do not rupture
Anapolytic
Segments overlap
Craspedote
Segments do not overlap
Acraspedote
In anapolytic gravid segments, how are eggs released?
Through the uterine pore
Budding or growth zone of cestodes
Neck
Cestodes in pseudophyllidea: (2)
D. latum
Spirometra
Cestodes in cyclophillidea: (4)
Taenia spp.
Hymenolepis nana
Hymenolepis diminuta
Echinococcus granulosus
Bump-like protrusion in the scolex; retractable
Rostellum
Pseudo vs. Cyclo
Scolex
P: Spatulate with bothria (false sucker)
C: Globular Scolex with 4 acetabula
Pseudo vs. Cyclo
Gravid Segments
a. Genital pore
b. Uterine pore
c. Apolysis
Pseudo:
a. Central portion
b. Central
c. X- but it is capable of Anapolytic
Cyclo:
a. Lateral
b. None
c. capable of apolysis
Pseudo vs. Cyclo
Eggs
P: Operculate, Immature
C: Non-operculated, Mature
