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0:37
YouTube
Prof Richard Harvey
Nasolacrimal "tear" duct opening
This is good example of the opening of the left nasolacrimal duct. The figure demonstrating the valves is the right side...sorry.. but it does show the multiple valves that exist to help prevent air and fluid 'refluxing' up the system. Correcting or preventing dysfunction of the tear duct system is common endoscopic procedure: https://youtu.be ...
1.5K views
Jul 2, 2024
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