Figure 9 - Peristalsis in striated muscle portion of the esophagus.
From the following article
Physiology of esophageal motility
Hiroshi Mashimo and Raj K. Goyal
GI Motility online (2006)
doi:10.1038/gimo3
Note that swallow (stimulus)-induced peristalsis is due to sequential activation of lower motor neurons in the nucleus ambiguus in the brainstem. When the peripheral end of the decentralized vagus nerve is electrically stimulated (VS), all segments of the esophagus contract simultaneously.
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