The torus tubarius [eustachian tube orifice] is formed by the medial end of the eustachian tube which projects into the lateral wall of the nasopharynx and consequently not be seen by means of conventional anterior rhinoscopy. It can best be seen as in this case by means of the nasal endoscope.
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![Eustachian Tube Orifice [left]](https://medtube.net/images/min/8284d8d74eb5b7731770e2331b6a3e6f/750/750/3)
![Eustachian Tube Orifice [left]](https://medtube.net/images/min/8284d8d74eb5b7731770e2331b6a3e6f/120/120/3)
![External Auditory Canal Junction [the Isthmus]](https://medtube.net/images/min/ed89ef2b09553cecbd7125f5b3fd1867/115/70/1 "External Auditory Canal Junction [the Isthmus]")
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