Echinococcus granulosus Egg Structure

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Questions and Answers

What is the function of the peristome?

To absorb nutrients

To aid in digestion

To expel waste

To lead to the mouth (correct)

What is the name of the opening at the posterior end?

Cytopore

Cytostome

Peristome

Cytopyge (correct)

Where is the cytostome located?

At the anterior end (correct)

Outside the cell

At the posterior end

In the middle of the cell

What is the relationship between the peristome and the cytostome?

The peristome leads to the cytostome Signup and view all the answers

What is the purpose of the cytopyge?

To expel waste Signup and view all the answers

What is the main difference between Islamic and non-Islamic countries in terms of Taenia solium infection?

The prevalence of raw or poorly cooked pork consumption Signup and view all the answers

What is the characteristic of the scolex of Taenia solium?

It has suckers and hooks Signup and view all the answers

What is the term for the tapeworm segment that contains a median uterus filled with eggs?

Gravid proglottid Signup and view all the answers

What is the other name for Taenia solium?

Armed tapeworm Signup and view all the answers

What is the characteristic of mature segments of tapeworms?

They contain male and female reproductive organs Signup and view all the answers

What is the shape of the egg of Echinococcus granulosus?

Round to oval Signup and view all the answers

What feature is characteristic of the shell of the egg of Echinococcus granulosus?

Radially striated Signup and view all the answers

What is the term for the six-hooked embryo inside the egg of Echinococcus granulosus?

Onchosphere Signup and view all the answers

What is the number of hooks present in the embryo inside the egg of Echinococcus granulosus?

Six Signup and view all the answers

What is the term for the egg of Echinococcus granulosus?

Ovum Signup and view all the answers

What is the characteristic body shape of worms in this phylum?

Compact dorsally and ventrally Signup and view all the answers

What is a unique feature of the reproductive system of these worms?

Mature segment with male and female reproductive system Signup and view all the answers

How do these worms obtain nutrients from their host?

Through absorption from the host's intestine Signup and view all the answers

What is absent in the body of these worms?

Digestive system Signup and view all the answers

What is the term for the characteristic of having both male and female reproductive systems?

Monoecious Signup and view all the answers

How many proglottids does Taenia solium typically have?

800-1000 Signup and view all the answers

What is the composition of Taenia solium?

Head, neck, and 800-1000 proglottids Signup and view all the answers

What is a characteristic of the proglottids of Taenia solium?

They have both immature and mature forms Signup and view all the answers

What can be found in the proglottids of Taenia solium?

Immature proglottid Signup and view all the answers

What is the purpose of the proglottids in Taenia solium?

To reproduce and produce eggs Signup and view all the answers

Study Notes

Egg (Ovum) of Echinococcus granulosus

Shape: Round to Oval
Radially striated shell
Onchosphere (Hexacanth embryo) has:
- Six-hooked embryo inside the egg
- Anterior end: Groove (peristome) leading to mouth (cytostome)
- Posterior end: Small anal pore (cytopyge)

Characteristics of Phylum

Compact bodies: Dorsally and ventrally
Hermaphroditic helminthic (monoecious): Mature segment has male and female reproductive system
No digestive system: No mouth, no gut, no anus
Absorb food from host's intestine through tegument
No alimentary canal

Taenia solium (Pork Tapeworm)

Also known as armed tapeworm
Found in many parts of the world where pork is eaten raw or poorly cooked
Rarely found in Islamic countries
Scolex (head) has:
- Suckers
- Hooks
Composition:
- Head and neck
- 800-1000 proglottids
- Proglottids types:
  - Immature proglottid
  - Mature proglottid (contains male and female reproductive organs)
  - Gravid proglottid (has a median uterus filled with eggs)