Click on image to view larger version.
Figure 5. The EMG activity of muscles involved in one pharyngeal swallow as recorded from the anesthetized animal (e.g., cat, dog, monkey). (A) The level of EMG activity can decrease below its background level, suggesting inhibition of that muscle, and then recruit with much activity followed by further inhibition. The increased EMG activity precedes the contraction of the muscle. The diaphragm ceases all activity during a pharyngeal swallow (adapted with permission from Doty and Bosma JF [1956]). (B) Location of some of the muscles involved in the earliest onset of the pharyngeal swallow (adapted with permission from Dickson and Dickson [1982]).
