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Inferior constrictor of pharynx

Lowest part of outer “circular” muscle layer of pharynx; origin, outer surfaces of thyroid (thyropharyngeal part) and cricoid (cricopharyngeal part, musculus cricopharyngeus; superior or upper esophageal sphincter muscle) cartilages; insertion, pharyngeal raphe in the posterior portion of wall of pharynx; action, narrows lower part of pharynx in swallowing, the cricopharyngeal part has a sphincteric function for the esophagus, allowing some voluntary control of eructation and reflux; nerve supply, pharyngeal plexus (cranial root of accessory nerve via the vagus) and rami of the external and recurrent laryngeal nerves.
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