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A Re-Examination of Oesophageal Ultrastructure in Ditylenchus Dipsaci (Nematoda, Tylenchida) With Some Observations On Intestinal Structure

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For more content, see Nematology.

The structure of the oesophagus of Ditylenchus dipsaci was examined by transmission electron microscopy of serial sections. The structure of the procorpus was essentially similar to that of other tylenchs examined; it houses the cell bodies of the stylet protractor muscles at its anterior end and has a circular lumen throughout surrounded by cells with a complex of tight junctions. Where it joins the metacorpus, a set of radial muscles attach to the basement membrane and to the cuticular lumen-lining; their function is discussed. In this nematode, which feeds both passively and actively, the metacorpus is a somewhat slender bulb with a rather weak musculature. The long isthmus lacks muscles and the postcorpus incorporates the three discrete oesophageal gland cells. The oesophago-intestinal junction contains a typical unlined valve formed by two specific cells. The few cells of the anterior intestine are characterised by thin microvilli with a smooth surface; the mid-intestinal microvilli are thicker and have a ridged surface.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England.


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