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Phylum Nematoda
this phylum consists of roundworms
-pseudocoel
-complete gut
pseudocoel
fluid filled body cavity
Ascaris
genus of roundworm parasites that live in the intestines of pigs, horses, and humans
-phylum nematoda
Anterior mouth
Lateral lines
Genital Pore (Ascaris)
Ascaris cross section
Genus Trichinella
Phylum Nematoda
Trichinella life cycle
Found in pigs (eating undercooked pork), rats, people, dogs, cats, etc.
Adult worms burrow in the mucosa of the small intestine where females produce living young
Juveniles can penetrate blood vessels and are carried throughout the body and can be found in almost any tissue or body space.
If the young penetrate skeletal muscle cells, it becomes an intraceullar parasite
These transform the muscle fibers into nurse cells to nourish the worm