Figure 1 - Oropharyngeal swallowing mechanism.
From the following article
Oral, pharyngeal and esophageal motor function in aging
JoAnne Robbins, Allison Duke Bridges and Andrew Taylor
GI Motility online (2006)
doi:10.1038/gimo39
The mechanism may be divided into two basic structural subsystems, horizontal and vertical, that mirror direction of bolus flow. (Source: Netter medical illustration used with permission of Elsevier. All rights reserved.)
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