The Normal Ear
In its typical express, the Eustachian tube stays shut, yet it will open when you yawn, swallow, bite, or hold your nose and blow. The reason for the Eustachian tube is to give natural air to the center ear space and to balance pressure between the external ear and the center ear. At any point can't help thinking about why your ears "pop" when you go up or down in a plane or a lift in a tall structure? That sound is your Eustachian tube(s) opening and shutting to balance the gaseous tension in your ears. The cochlea is comprised of three compartments (scala tympani, scala media, scala vestibule) that are isolated from one another by two films (basilar layer and Reissner's film). A little (organ of Corti) sits on top of the basilar film. This organ contains hair cells, which convert the mechanical energy from the vibrations of the basilar film into electrical motivations ear canal structure . How We Hear ? The pinna gets sound waves and channels them down the outside