The Pharynx and its Muscles
The pharynx is the structure that passes directly behind the mouth and nose, and delivers both food and air into the proper receiving tubes. The massive number of muscles that you can see layered on top of each other are required to both pass the food bolus into the esophagus, and ensure that the trachea is closed off when food or drink is passing by it.
The Dissection of the Human Body. George Viner Ellis and G. H. Ford, 1891.