The Mendelsohn maneuver is taught by having the patient place
their fingers lightly over the thyroid cartilage and then trying to
swallow. When the thyroid cartilage reaches the top part of its
elevation during the swallow the patient is supposed to try to keep it
in this position for a second or two. The crycopharyngeus upper
esophageal sphincter is stretched by this excursion and is mechanically
opened. There may also be some reflex inhibition of the sphincter, but
the benefit is probably mostly mechanical. Logeman's book on dysphagia
has a much better description.
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