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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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References

Berntzen, A. K. (1961). The in vitro cultivation of tapeworms. I. Growth of Hymenolepis diminuta (Cestoda, Cyclophyllidea). J. Parasit. 47, 351–5.CrossRefGoogle Scholar
Prosser, C. L., Bishop, D. W., Brown, F. A., John, T. L. & Wulff, V. J. (1952). Comparative Animal Physiology. Philadelphia: Saunders.Google Scholar
Scott, J. S. (1965). The development and morphology of Polycercus lumbrici. Parasitology, 55, 127–43.CrossRefGoogle Scholar
Scott, J. W. (1913). Experiments with tapeworms. I. Some factors producing evagination of a Cysticercus. Biol. Bull. mar. biol. Lab., Woods Hole, 25, 304–12.CrossRefGoogle Scholar
Smyth, J. D. (1946). Studies on tapeworm physiology. I. The cultivation of Schistocephalus solidus in vitro. J. exp. Biol. 23, 47–70.CrossRefGoogle ScholarPubMed
Smyth, J. D. (1947). Studies on tapeworm physiology. III. Aseptic cultivation of larval Diphyllobothriidae in vitro. J. exp. Biol. 24, 374–86.CrossRefGoogle Scholar
Smyth, J. D. (1958). Cultivation and development of larval cestode fragments in vitro. Nature, Lond. 101, 1119–22.CrossRefGoogle Scholar
De Waele, A. (1953). Recherches sur les migrations des cestodes. Bull. Acad. r. Belg. Cl. Sci. (5), 19, 837–8.Google Scholar