para lec 3 NMU

cestoda (tapeworm)

shape ?

size ? teguments ?

-Shape: Long, flat, segmented and tape-like.

-Size: - From few millimeters to several meters.

- Has smooth protective tegument.

cestoda (tapeworm) adult body is divided into ? (3) how many suckers ?

scolex (head) (4 suckers with or without rostellum and hooks)

neck (thin part forming all new segments)

strobila (segments or proglottid)

strobila of cestoda may be ? 3

3 انواع اي هم

• Immature: follow the neck, small, without developed genitalia.

• Mature: majority of segments, with well developed genitalia.

• Gravid: lowermost segments, contain only uterus filled with eggs.

what systems does cestoda have ? 2

reproductive system and excretory system

معندوش الاتنين الجايين دول

it doesnt have digestive system (nutrients are absorbed through body wall) and circulatory system

cestode excretory system consists of ?

Multiple flame cells and collecting tubules opening posteriorly on bladder at the last segment.

cestode reproductive system consists of ?

-Multiple testes & bilobed ovary are present in each segment opening together through their ducts in common genital pore

طبعا طبعا كلهم hermaphrodites

cestode

definitive host ?

intermediate host ?

Definitive host: human for most cestodes.

Intermediate host: mainly animals or arthropods.

cestodes complete their life cycle in how many hosts ? exception ?

Cestodes complete their life cycles in two different hosts,

except Hymenolepis nana as man can act as both definitive and intermediate host.

enumerate the 3 larval stages of cestodes ?

1-egg

2-onchosphere

3-cystic larval stage

cestodes egg morpholgy

mature non operculated eggs

what is the infective stage for most cestodes

cystic larval stage

ايه ال cestode

اللي هيجيلك لو عملت الاتي

Ingestion of egg with contaminated food and drink: (3)

a. Taenia solium larva (Cysticercosis)

b. Echinococcus granulosus (hydatidosis)

c. Hymenolepis nana

ايه ال cestode

اللي هيجيلك لو عملت الاتي

Ingestion of larva in

undercooked meat:

undercooked pork:

a. Undercooked meat: Taenia saginata

b. Undercooked pork: Taenia solium

ايه ال cestode

اللي هيجيلك لو عملت الاتي

Ingestion of insect vector containing larva

Hymenolepis nana

ايه ال cestode

اللي هيجيلك لو حصل الاتي

Autoinfection (2)

a. Taenia solium larva (Cysticercosis)

b. Hymenolepis nana

intestinal cestodes are ? (3)

tth تتح 😄

• Taenia saginata

• Taenia solium

• Hymenolepis nana

tissue cestodes are ? (3)

eth اتح 😃

• Echinococcus granulosus

• Taenia solium

• Hymenolepis nana

compare between intestinal cestodes and tissue cestodes

man is which host ?

human harbor (eat) what ?

human eat the cestode in which stage ?

main complaint or problem for the host is ?

diagnosis depends on ?

compare between trematodes and cestodes according to

shape ?

size ?

tegument ?

organs of attachment ?

digestive system ?

genital system ?

compare between trematodes and cestodes according to

I.H ?

stages of life cycle ?

infective stage ?

diagnostic stage ?