Heligmosomoides polygyrus: Difference between revisions
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== Life cycle == |
== Life cycle == |
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Heligmosomoides polygyrus have a direct [[Biological life cycle|life cycle]]. The eggs pass out with the [[faeces]] of the [[host (biology)|host]] into the environment. After two days they hatch as [[larva]]e which are about 300 μm in length. The larvae moult 3 days later but retain the shed cuticle for protection. It is at this point they become infective. The larvae shed its outer protective sheath after they are eaten by the host. The larvae then penetrate the [[submucosa]] of the duodenum where they undergo two further moults. |
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About seven days later the male and female adult worms emerge into the [[lumen (anatomy)|lumen]] of the [[duodenum]]. They attach to the epithelial layer of the duodenum where they feed the contents of the gut. when adult worms mate their eggs are shed in the faeces. The complete life cycle from egg till egg takes a minimum of 15 days, and the female worms will live inside their host for 8 months. |
About seven days later the male and female adult worms emerge into the [[lumen (anatomy)|lumen]] of the [[duodenum]]. They attach to the epithelial layer of the duodenum where they feed the contents of the gut. when adult worms mate their eggs are shed in the faeces. The complete life cycle from egg till egg takes a minimum of 15 days, and the female worms will live inside their host for 8 months. |
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Revision as of 11:43, 11 August 2015
 | This article needs additional citations for verification. (December 2009) |
| Heligmosomoides polygyrus | |
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| Female H. polygyrus from the digestive tractus of a woodmouse | |
| Scientific classification | |
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| Species: | H. polygyrus
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| Binomial name | |
| Heligmosomoides polygyrus | |
Heligmosomoides polygyrus (formerly known as Nematospiroides dubius[1]) is a common parasitic nematode found in the duodenum and small intestine of woodmice and other rodents.
They are 5-20 mm in length and bright red due to the pigmentation of their tissues. They are usually heavily coiled, with the female having 12-15 coils and the male 8-12. The male can be distinguished from the female by a prominent copulatory bursa and two long, thin spicules at the posterior end.
These worms often form cysts in the wall of the intestine. These cysts often become infected with bacteria, but it is not yet known if these are harmful to the host.
This organism is often used to model human helminth infection in laboratory mice.
Life cycle
Heligmosomoides polygyrus have a direct life cycle. The eggs pass out with the faeces of the host into the environment. After two days they hatch as larvae which are about 300 μm in length. The larvae moult 3 days later but retain the shed cuticle for protection. It is at this point they become infective. The larvae shed its outer protective sheath after they are eaten by the host. The larvae then penetrate the submucosa of the duodenum where they undergo two further moults.
About seven days later the male and female adult worms emerge into the lumen of the duodenum. They attach to the epithelial layer of the duodenum where they feed the contents of the gut. when adult worms mate their eggs are shed in the faeces. The complete life cycle from egg till egg takes a minimum of 15 days, and the female worms will live inside their host for 8 months.
References
- ^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.4061/2011/140293, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with
|doi=10.4061/2011/140293instead.