Aporocotyle simplex (Odhner, 1900)
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publication ID |
https://doi.org/ 10.1016/j.jcz.2023.05.003 |
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DOI |
https://doi.org/10.5281/zenodo.10375359 |
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persistent identifier |
https://treatment.plazi.org/id/03CA3B6F-F337-FFCD-FCD4-D76CFA87C23E |
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treatment provided by |
Felipe |
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scientific name |
Aporocotyle simplex |
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3.2. The anterior esophagus of A. simplex View in CoL
The long unbranched esophagus leads directly from the muscular anterior foregut ( Fig. 1D, G View Fig and 2A View Fig ). The esophageal epithelial lining is a prolongation of the anterior foregut epithelium with sunken cell bodies ( Fig. 2C View Fig ). The epithelial syncytial lining of the short anterior esophageal portion projects its cytoplasm into the lumen, possessing luminal irregular, broad and angular cytoplasmic protrusions variable in shape and size ( Fig. 2B, C, E View Fig ). Due to these cytoplasmic protrusions, the esophageal cytoplasmic lining varies in thickness from 0.2 to 6.5 μm and contains a number of electron-dense bodies, which are similar to those that fill the body syncytial tegumental cytoplasm and anterior foregut epithelium ( Fig. 2B, C, E View Fig ). Besides tegumental dense bodies, numerous rounded vesicles (about 0.2–0.3 μm in diameter), with moderately dense content or empty-looking, fill the cytoplasmic matrix ( Fig. 2B, C, E View Fig ). These vesicles may liberate their contents into the esophageal lumen ( Fig. 2B, C, E View Fig ). An extensive system of regularly arranged tubular structures is present in the moderately dense cytoplasm of the esophageal lining ( Fig. 2E View Fig ). The luminal surface of the epithelial lining is smooth, the basal plasma membrane is surrounded by a thin electron-dense basal lamina and a thick layer of extracellular matrix, below which are thick bands of circular and longitudinal myofibrils ( Fig. 2B and C View Fig ). Sunken cell body processes connect to the epithelial lining and open into the epithelial cytoplasm ( Fig. 2C View Fig ). The distal portion of these processes contains numerous longitudinally oriented microtubules and electron-dense bodies in their cytoplasmic matrix ( Fig. 2C View Fig ). Electron-dense membranous whorls may be present within the anterior foregut as well as within the anterior esophageal lumen ( Fig. 2B View Fig ).
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