Swallowing is one of the very first acts that a human child elicits in its lifespan. Since swallowing is acquired very early and easily, it is taken for granted many a times. But very few know that a highly complex neural network is triggered in order to carry out a single swallow.
The lips, tongue, jaw, soft palate and pharyngeal wall are used to bring about a swallow. Undeniably, these are the same set of muscles used while speaking. Hence it is very commonly seen that speech and swallowing functions both are hampered as a sequel of one another.
As discussed under the title of “Speech Disorder” in MND/ALS, oral muscles are affected. As an effect, the oral muscles (specially tongue) are unable to push the food posteriorly into the food pipe, hence creating a risk for food to enter the airway. Food entering the airway (lungs) is clinically known as “aspiration”.