Nan is correct, the tongue participates in 2 phases of the swallow: the
oral preparatory phase, and the oral phase.
Peristalsis begins with the tongue. Several very respected scientists
(including James Bosma, MD, who dedicated his career to studying
swallowing difficulties) believed that the timing of suck/swallow
movements is critical for the peristalsis of the entire digestive tract.
Catherine Watson Genna, IBCLC NYC
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