Difference between revisions of "Ascaridoidea"
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| − | # | + | {{unfinished}} |
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| + | {{toplink | ||
| + | |backcolour = | ||
| + | |linkpage =Parasites | ||
| + | |linktext =PARASITES | ||
| + | |pagetype=Bugs | ||
| + | |sublink1=Nematodes | ||
| + | |subtext1=NEMATODES | ||
| + | }} | ||
| + | <br> | ||
| + | == General Appearance == | ||
| + | *Non-bursate. | ||
| + | *Big fleshy worms; typically 5-40cm long (depending on age, sex and species). | ||
| + | *Three lips around the mouth. | ||
| + | *A single-bulbed pharynx. | ||
| + | |||
| + | |||
| + | == General Life-Cycle == | ||
| + | *Adult females in small intestine lay eggs. | ||
| + | *Eggs have a thick protective shell. | ||
| + | *Some also have a sticky outer albuminoid coat. | ||
| + | *Eggs passed in faeces. | ||
| + | *L1 → infective L2 inside the egg. | ||
| + | *Infection is by ingestion of the embryonated egg (egg in which a larva has formed). | ||
| + | *Eggs can remain viable in humid environment for up to 5years. | ||
| + | *After hatching in the intestine, the larvae of most species (but not all) undergo hepato-tracheal migration: | ||
| + | **egg hatches in intestine → larva penetrates intestinal mucosa → hepatic portal blood → liver → venous blood → heart → lung capillaries → alveoli → ascends trachea → swallowed → small intestine (where the adults develop). | ||
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| + | NOTE: there are important variations on this theme; for example, the migratory larvae of some species can cross the placenta or enter the mammary glands (examples of vertical transmission); while some species will utilise paratenic or intermediate hosts. | ||
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| + | [[Ascaridida]] | ||
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| + | Occlusion of pancreatic ducts sometimes happens [[Pancreas Parasitic - Pathology|Pancreas - parasitic]] | ||
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| + | In [[Peritoneal Cavity Parasitic - Pathology]] | ||
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| + | *''Parascaris equorum'' in [[Respiratory Parasitic Infections - Pathology#In Horses|rhinitis and lungs]] | ||
| + | *Ascarid larvae in [[Muscles Inflammatory - Pathology#Nematodes|myositis]] | ||
Revision as of 13:13, 23 December 2008
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This article is still under construction. |
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General Appearance
- Non-bursate.
- Big fleshy worms; typically 5-40cm long (depending on age, sex and species).
- Three lips around the mouth.
- A single-bulbed pharynx.
General Life-Cycle
- Adult females in small intestine lay eggs.
- Eggs have a thick protective shell.
- Some also have a sticky outer albuminoid coat.
- Eggs passed in faeces.
- L1 → infective L2 inside the egg.
- Infection is by ingestion of the embryonated egg (egg in which a larva has formed).
- Eggs can remain viable in humid environment for up to 5years.
- After hatching in the intestine, the larvae of most species (but not all) undergo hepato-tracheal migration:
- egg hatches in intestine → larva penetrates intestinal mucosa → hepatic portal blood → liver → venous blood → heart → lung capillaries → alveoli → ascends trachea → swallowed → small intestine (where the adults develop).
NOTE: there are important variations on this theme; for example, the migratory larvae of some species can cross the placenta or enter the mammary glands (examples of vertical transmission); while some species will utilise paratenic or intermediate hosts.
Occlusion of pancreatic ducts sometimes happens Pancreas - parasitic
In Peritoneal Cavity Parasitic - Pathology
- Parascaris equorum in rhinitis and lungs
- Ascarid larvae in myositis