So now let's move on to our esophagus. So the esophagus is a relatively long and relatively narrow passageway, a cylindrical passageway that allows the movement of our bolus, the food from the pharynx and into our stomach. So the esophagus is a relatively long and narrow passageway that connects the pharynx to our stomach. It runs along and in the back of the windpipe and it's found in front of our spinal cord. Now, the upper portion of our esophagus consists of skeletal muscle while the rest of it consists of involuntary smooth muscle. And this basically means that although we can actually initiate the process of swallowing and we can actually voluntarily control the movement of food into the upper region of the esophagus, the rest of that movement is controlled, involuntary.