Nematodes Flashcards
(22 cards)
helminths differ from protozoas because
they are multicellular and contain internal organ systems
nematodes known as
intestinal round worms
three morphologic forms of nematodes
eggs
larvae
adult worms
juvenile worms
larvae
female sex cells after fertilization
eggs
description of larvae
long and slender
adult worms reside in
intestines
once outside the body, the larvae inside the eggs require what?
moisture from soil and 2 to 4 weeks for continued development
nematodes that requires tissue involvement in life cycle
Trichinella and Dracunculus
in diagnosis of nematodes may be accomplished by the recovery of
eggs, larvae, occasional adult worms
diagnostic procedures
cellophane tape prep
serologic procedures
3 factors that affect severity of nematode infection
1) number of worms present
2) lenth of time the infection persists
3) overall health of the host
protoplasm
fertilized egg
male and female gametes together
an egg that contains L1, L2, L3
embryonated eggs
larva stages of nematodes
4 stages
L1, L2, L3, L4
1st stage (L1) to 2nd stage larvae (L2) is also your
Rhabditiform larva
3rd stage (L3) is also your
Filariform larva
characteristics of Rhabditiform larva
buccal/bibig
thick
thick tail
“feeding stage”
characteristics of filariform larva
no buccal/walang bibig slender thin tail moving invasive
mouth to throat organ of larvae
buccal capsule
mouth - throat to esophagus
buccal cavity
nematodes general characteristics
1) multicellular eukaryotic invertibrates
2) adults have separate sexes, some are parthenogenic
3) mating-induce male apoptosis
4) body regions are onsegmented, elongated, cylindrical with bilateral symmetry
5) teguments have glycocalyx layers with phosphatases, estrases, kinases, hydrolases, peptidases
