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16 Cards in this Set

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Nematoda

Round Worms - psuedocoelomate, dioecious, dimorphic

Amphid

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

Phasmid

Chemosensory organ at the posterior and of nematodes

Eutely

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)

Trichuriasis

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"

Trichinosis

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

Filariform

Non-feeding J3 stage of hookworms

Rhabditiform

Feeding J1 & J2 stages of hookworms

Developmental arrest

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

Hookworms

Necator americanus & Ancylostoma duodenale