Now, the pinna, what it basically does is it captures all the energy that is carried by our mechanical wave and it directs that mechanical wave into the ear canal. And because the pinna has such a large surface area, it basically acts to amplify the force that our pressure wave actually creates. So the human ear can detect variations in air pressure known as mechanical waves. The pina, also known as the Oracle, acts to capture much of the energy of the mechanical wave and transmits that mechanical wave through the ear canal, which is basically this portion here. So the ear canal is also part of the outer portion of the ear. Now, the mechanical wave then moves along the ear canal and towards the end of our ear canal.