Lesson 3 - Anatomical Structure of Cestode

Question 1

long, flat, ribbon-like, segmented organisms of 1mm to >2-4m in length that typically have a definite head, a short unsegmented portion, and three to thousands of segments each harboring one or more sets of male and female reproductve organs

Answer 1

tapeworm; class Cestoda

Question 2

described species of tapeworm

Answer 2

~5000

Question 3

length of tapeworm

Answer 3

1mm to >2-4m, up to 20 m

Question 4

head of tapeworm

Answer 4

scolex

Question 5

unsegmented portion of tapeworm

Answer 5

Neck

Question 6

used by the tapeworm to attach itself to the inside of the intestines of its specific host

Answer 6

• suckers
• crown of hooklets

Question 7

general morphology of tapeworm

Answer 7

1. scolex
2. neck
3. strobila
4. tegument (syncytial)
5. reproductive organ (hermaphorditic)
6. nervous system (cerebral ganglia, longitudinal nerve cords, transverse commissures)

Question 8

unarmed

Answer 8

no hook

Question 9

armed

Answer 9

hooked

Question 10

the segmented part of the body of a tapeworm that consists of a long chain of proglottids

Answer 10

strobila

Question 11

repeated reproductive units

Answer 11

proglottid

Question 12

contains male and female reproductive structures

Answer 12

mature proglottid

Question 13

contains the eggs

Answer 13

gravid proglottid

Question 14

parts of the scolex

Answer 14

1. sucker
2. rostellum
3. hook

Question 15

cup-like attachments in cestodes

Answer 15

suckers

Question 16

for anchoring in cestodes

Answer 16

hook

Question 17

• muscular, cone-shaped structure that protrudes from the front end of the tapeworm.
• armed with hooks that attach the tapeworm to the host’s intestinal wall.

Answer 17

rostellum

Question 18

multi-nucleated cytoplasm

Answer 18

syncytial

Question 19

• not separated by cell membrane
• allows absorption of nutrients
• regenerates to protect itself
• has glycocalyx

Answer 19

tegument

Question 20

nervous system of cestodes

Answer 20

1. cerebral ganglia
2. longitudinal nerve cords
3. transverse commissures

Question 21

• simple brain
• located in scolex

Answer 21

cerebral ganglia

Question 22

from scolex to posterior end

Answer 22

longitudinal nerve cords

Question 23

helps in signal transmission on each proglottid

Answer 23

transverse commissures

Question 24

produce nutrients for the egg

Answer 24

vitelline gland

Question 25

- produce proteination substance that creates a rigid structure - creates egg shells

Answer 25

shell gland

Question 26

contains the egg

Answer 26

uterus

Question 27

where eggs are released

Answer 27

genital pore

Question 28

Taenia saginata number of uterine branches

Answer 28

15-30

Question 29

Taenia soleum number of uterine branches

Answer 29

7-13

Question 30

membrane of immature egg

Answer 30

hyaline embryonic membrane

Question 31

- 1st stage - tapeworm embryo that has six hooks and is the earliest differentiated stage of a cyclophyllidean tapeworm - also called also hexacanth embryo

Answer 31

oncosphere

Question 32

Taenia saginata - develops in muscle (beef) - infective stage for man

Answer 32

cysticercus bovis

Question 33

Taenia solium - develops in muscles (pork) - infective stage for humans

Answer 33

cysticercus cellulosa