Physiology of the Swallow. This part of the swallow is voluntary. It is a mechanical phase that can be by-passed by dropping liquid or food into the back of the throat. … The food and saliva form a bolus of material.
What are the 4 stages of swallowing?
Swallowing is commonly divided into the following four phases: Oral Preparatory—voluntary phase during which food or liquid is manipulated in the mouth to form a cohesive bolus—includes sucking liquids, manipulating soft boluses, and chewing solid food.
What is the function of swallowing?
Food passes from the pharynx into the esophagus; the upper esophageal sphincter then immediately closes, preventing the flow of food back into the mouth. Once the food is in the esophagus, the final phase of swallowing begins. The larynx lowers, the glottis opens, and breathing resumes.
How many muscles used swallowing?
Swallowing is a complex process. Some 50 pairs of muscles and many nerves work to receive food into the mouth, prepare it, and move it from the mouth to the stomach. This happens in three stages. During the first stage, called the oral phase, the tongue collects the food or liquid, making it ready for swallowing.
What part of the brain is responsible for swallowing?
The medulla oblongata controls breathing, blood pressure, heart rhythms and swallowing. Messages from the cortex to the spinal cord and nerves that branch from the spinal cord are sent through the pons and the brainstem. Destruction of these regions of the brain will cause “brain death.”
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