... attached laterally to the edges of the signet of the cricoid which it pulls with an incomprehensible power against the posterior wall of the hypopharynx, thus closing the mouth of the esophagus. Its other attachment is in the median posterior raphe. Between these circular fibers (the cricopharyngeal muscle) and the oblique fibers of the inferior constrictor muscle there is a weakly supported point through which the esophageal wall ... — Bronchoscopy and Esophagoscopy - A Manual of Peroral Endoscopy and Laryngeal Surgery • Chevalier Jackson
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