CSD-2259 Lecture Notes - Lecture 15: Isthmus Of The Fauces, Pharyngeal Muscles, Swallowing
Document Summary
What are feeding and swallowing disorders: the normal swallow- also called deglutition, the neuromuscular act of moving substances from the oral cavity to the esophagus. We swallow about 580 times a day. Oral phase- move bolus to rear of oral cavity and prepare it for propulsion down throat: begins as tongue propels bolus to back of the mouth (cid:862)st(cid:396)ippi(cid:374)g a(cid:272)tio(cid:374)(cid:863) Accomplished by tongue pressing upward against hard palate: (cid:862)st(cid:396)ippi(cid:374)g a(cid:272)tio(cid:374)(cid:863) alo(cid:374)g with te(cid:374)sio(cid:374) i(cid:374) (cid:272)heeks (cid:272)(cid:396)eated (cid:271)(cid:455) the buccal muscles create pressure that pushes bolus backward toward pharynx, usually takes 1-1. 5 seconds, normal respiration through the nose. Pharyngeal phase- propel bolus down through throat to entrance of esophagus: begins when bolus reaches posterior portion of oral cavity, the anterior faucial pillars. Pillars comprise band of muscular tissue that extends from both sides of palate to the tongue. Cricopharyngeus muscle, or upper esophageal sphincter is the juncture between the pharynx and esophagus.