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Evagination of the cysticercoid in Polycercus lumbrici

Published online by Cambridge University Press:  06 April 2009

J. S. Scott
J. S. Scott
Affiliation:
Department of Natural History, University of St Andrews, Scotland
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Extract

A number of experiments was carried out on Polycercus lumbrici to induce evagination of the cysticercoid in vitro. The results indicate that in nature the containing cyst is ruptured by pressure and abrasion in the gizzard of the bird host and that evagination is induced mainly by the action of gastric juice followed by pancreatic juice, heat assisting the process by exciting vigorous movements in the larvae. By a process of elimination it has been shown that the effective agents are the pepsin in the gastric juice and pancreatin in the pancreatic juice. The latter probably causes contraction of the muscles of the wall of the caudal vesicle which forces out the scolex.

Type
Research Article
Information
Parasitology , Volume 55 , Issue 3 , August 1965 , pp. 421 - 425
Copyright
Copyright © Cambridge University Press 1965

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