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Electron Microscopical Studies On Ditylenchus Dipsaci Ii. Oesophagus

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The three main components of the oesophagus of Ditylenchus dipsaci are the oesophageal wall, the lumen, the associated membranes collectively referred to here as the oesophageal lumen complex, and the dorsal and two subventral glands. The oesophageal wall is not a syncytium. In cross-section the wall of the procorpus consists of two cells anteriorly and four posteriorly. There are twelve cells in the metacorpus, six of which are muscle cells. Only the basement membrane remains of the wall of the isthmus. The wall of the postcorpus is of uneven thickness and serves as an elastic sac for the three glands. The oesophageal lumen is cylindrical from the base of the stylet knobs to the valve of the metacorpus. It is triradiate from the valve to the oesophago-intestinal junction. The lumen is surrounded throughout its length by eight or nine pairs of membranes. It is the subdorsal and ventral extensions of the membranes that produce the triradiateness of the oesophagus. The dorsal gland is a separate entity but the two subventral glands become fused in the anterior half of the postcorpus. A valve is present at the oesophago-intestinal junction.

Affiliations: 1: Department of Zoology, University of Manitoba, Canada

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/content/journals/10.1163/187529268x00066
1968-01-01
2016-12-11

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