Skip to main content
Select Source:

ascaris

ascaris Nematode worms (Nematoda), all of which are parasites, some of mammals, others of birds, and some of invertebrates. The group includes Toxocara canis and Ascaris lumbricoides (the dog and human ascarids respectively). In both these species, eggs are voided and begin to develop in faeces. If ingested by another host, the eggs hatch in the small intestine, releasing small worms that penetrate the gut wall, enter the blood stream, and are carried to the lungs. There they break into alveoli (see ALVEOLUS), move along air passageways to the oesophagus, and are swallowed, returning as adults to the intestine, where they lay eggs.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"ascaris." A Dictionary of Zoology. . Encyclopedia.com. 22 Aug. 2017 <http://www.encyclopedia.com>.

"ascaris." A Dictionary of Zoology. . Encyclopedia.com. (August 22, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ascaris

"ascaris." A Dictionary of Zoology. . Retrieved August 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ascaris

Ascaris

Ascaris (ass-kă-ris) n. a genus of parasitic nematode worms. A. lumbricoides the largest of the human intestinal nematodes. Larvae hatch out in the intestine and then migrate via the hepatic portal vein, liver, heart, lungs, windpipe, and pharynx, before returning to the intestine where they later develop into adult worms (see also ascariasis).

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Ascaris." A Dictionary of Nursing. . Encyclopedia.com. 22 Aug. 2017 <http://www.encyclopedia.com>.

"Ascaris." A Dictionary of Nursing. . Encyclopedia.com. (August 22, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/ascaris

"Ascaris." A Dictionary of Nursing. . Retrieved August 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/ascaris