1 / 13

Class Cestoda

Class Cestoda. General characters. All tape worms consist of long, multi-segmented body. Cuticle of the body is provided with pores through which the worm takes its nutrients (no digestive system ) They are hermaphroditic. The adult worm is divided into 3 distinct parts: Head (scolex),

agatha
Download Presentation

Class Cestoda

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Class Cestoda

  2. General characters • All tape worms consist of long, multi-segmented body. • Cuticle of the body is provided with pores through which the worm takes its nutrients (no digestive system) • They are hermaphroditic. • The adult worm is divided into 3 distinct parts: • Head (scolex), • neck • strobilla 1. Head or scolex : usually provided with muscular suckers and crown of hooks (rostellum) to attach to intestinal wall.

  3. General characters cont. 2.Neck 3. Strobilla: the long segmented body consists of segments of three types (i) the immature segments: which follow the neck region (ii) the mature segments: containing both sex organs and are responsible for reproduction (iii) the gravid segments: filledwith fertilized eggs. • Eggs :contain hexacanth embryo • All worms have intermediate host except Hymenolipis nana

  4. Examples of class cestoda 1- Taenia sp: Taenia saginata Taenia solium 2- Hymenolepis sp: Hymenolepis diminuta 3- Dipylidium caninum 4- Echinococcus granulosus

  5. 1.Taenia saginata Taenia saginata mature segment: nearly square, bilobed ovary, scattered testis, uterus:median tube (4X) Taenia saginata gravid segment longer than broad branched uterus filled with eggs (4X) Egg of Taenia sp. circular,radiating double wall (H.P).

  6. Taenia saginata cont. • Location of adult: Small intestine of man • Intermediate host : Cattle • Infective stage : Cysticercus bovis • Mode of transmission: Eating insufficiently cooked meat containing cysticercus bovis • Diagnosis: Eggs & gravid segments in stool • Disease: Taeniasis

  7. 2. Hymenolepis diminuta (rat tape worm) Mature segments: broad than long characterized by 3 testis and one ovary in each segment (4X) Gravid segments : broad than long, enlarged uterus containing eggs (4X)

  8. 2.Hymenolepis diminuta cont. • Location of adult: Small intestine of rat occasionally man • Intermediate host: Rat flea • Infective stage: Cysticercoid • Mode of transmission: Ingestion of rat flea containing cysticercoid • Diagnosis: Eggs and gravid segments in stool • Disease: Hymenolepiasis

  9. 3. Dipylidium caninum (dog tape worm) Gravid segments: Longer than broad, wall deformed, enlarged uterus filled with eggs (4X) Mature segments: longer than broad, 2 genital pores, testis and ovaries (4X)

  10. Dipylidium caninum cont. Egg packet

  11. Dipylidium caninum cont. • Location of adult: Small intestine of dogs, occasionally man • Intermediate host: Dog flea • Infective stage: Cysticercoid • Mode of transmission: Ingestion of dog flea containing cysticercoid • Diagnosis: Egg packet in stool • Disease:Dipylidium caninum infection

  12. 4. Echinococcus granulosus Adult worm: scolex, immature, mature and gravid segments (4X) Scolex from hydatid sand (H.P)

  13. Echinococcus granulosus cont. • Location of adult: Small intestine of dogs • Location of hydatid cyst : Liver, lung, CNS and bone in man, cattle and sheep • Intermediate host : Cattle, sheep (man is an end stage intermediate host) • Infective stage: Eggs in feces • Mode of transmission: Man is infected by ingestion of eggs in dog feces • Diagnosis: Identification of hydatid cyst by X ray • Disease: Hydatid disease

More Related