The three structures that begin and allow the movement of food along our digestive canal, also known as the elementary canal, are the oral cavity, also known as aroma, the pharynx, as well as Aristophagus. So let's briefly discuss what the function is and what takes place within each one of these structures. And let's begin with the oral cavity. Now, the oral cavity cavity is also known as the mouth. And what the mouth does is initiates two important processes. One called mechanical digestion and the other one called chemical digestion.