KINESIOL 1YY3 Lecture Notes - Lecture 17: Amylase, Epiglottis, Rugae

• School: McMaster University
• Department: Kinesiology
• Course: KINESIOL 1YY3
• Professor: Krista Howarth

Document Summary

Using tongue, bolus pressed against hard and soft palates, forcing bolus posterior in oral cavity > swallowing initiated. Bolus is entering oropharynx and will move either superiorly or inferiorly, but body will try to block access to nasopharynx in order to bring it to stomach. As the bolus enters the oropharynx, tactile receptors send ap"s to the medulla oblongata (specifically, the swallowing center), then ap"s get sent back down through motor neurons to affect some response. In this image, the soft palate being elevated to block access to nasopharynx, and the larynx and pharynx move superiorly to receive the bolus. Carried out by the superior, middle, and inferior pharyngeal constrictors. These muscles will contract successively to force the bolus from pharynx into esophagus. Lef: superior helps close off the nasopharynx and middle helps push the bolus inferiorly. Right: bolus continues to move down (due to constrictors), passes over epiglottis and shuts it.