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The structure of the cuticle of Ascaris lumbricoides var. suis

Published online by Cambridge University Press:  06 April 2009

Alan F. Bird  and
Karl Deutsch
Alan F. Bird
Affiliation:
Department of Zoology, University of Edinburgh
Karl Deutsch
Affiliation:
Department of Zoology, University of Edinburgh
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Extract

1. Nine layers have been identified in the cuticle of Ascaris lumbricoides var. suis under the light microscope and their nomenclature is identical with that of van Bömmel.

2. The inner cortical layer consists of a distinct structure which is seen to be markedly different from the homogeneous layer when fresh frozen sections are examined under phase contrast.

3. Examination of the outer surface of the cortical layer under the electron microscope after layer stripping and sectioning has revealed the presence of a ridged osmiophilic layer which is less than a thousand Ångström units thick.

4. Longitudinal osmium-fixed sections, when examined under the electron microscope, have shown that the external cortical layer has radial striations which appear to link up with the striations which radiate from an aster-like process at the top of the structure arising from the ‘fibrillar layer’.

5. The osmium-fixed homogeneous layer, when viewed under the electron microscope, is seen to consist of fine radial striations.

6. The fibre layers do not show any finer structures when they are examined under the electron microscope. In longitudinal section, they are seen to consist of irregularly shaped fibres without an internal fibrillar structure. Layer stripping shows that they lack the type of periodic structure seen in collagen.

7. The basal lamella is similar, in that the electron microscope does not reveal any finer structures.

Type
Research Article
Information
Parasitology , Volume 47 , Issue 3-4 , December 1957 , pp. 319 - 328
Copyright
Copyright © Cambridge University Press 1957

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