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16 Cards in this Set

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Round Worms - psuedocoelomate, dioecious, dimorphic


Chemosensory organ on the "head" of nematodes ; may be secretory


Chemosensory organ at the posterior and of nematodes


Nuclear/cellular constancy - no new cells between juvenile and adult stages; growth comes from increase in cell size instead of cell number

General Nematode L.C.

Egg - J1 - J2 - J3 - J4 - Adults : 4 molts (j3 usually infective stage)


Trichuris trichiura

Whipworm disease

Trichuris trichiura

Dysentery, anemia, toe/finger clubbing, prolapsed rectum, occasionally death

Trichuris trichiura

Cause: humans infected after eating food contaminated by eggs from feces - "night soil"


Trichenella spiralis

Damage to the lining of the gut, nausea, sweating, diarrhea, secondary infections, fever and facial adema

Trichenella spiralis early pathology

Caused by meat predator consuming infected prey

Damage to blood vessels, localized edema, pneumonia, encephalitis, deafness, eye damage, potential death from myocarditis

Trichenella spiralis - middle phase pathology

Caused by circulating J1s damaging cells as they wander and penetrate cells

Muscle pain, loss of function of muscle cells, diaphragm encystment = difficulty breathing, masseter muscle = jaw swelling [may be misdiagnosed as mumps], death from heart or kidney failure

Trichenella spiralis - late pathology

Caused by nurse cell formation in muscle tissue


Non-feeding J3 stage of hookworms


Feeding J1 & J2 stages of hookworms

Developmental arrest

Adaptation to avoid harsh conditions (Ancylostoma duodenale) such as dry seasons [J3]


Necator americanus & Ancylostoma duodenale