how does the hearing sensory information get to the brain?

Answer 1

Via the auditory nerve.

Answer 2

It begins when sound waves strike the outside of the ear. Sound waves are vibrations that occur in air. When sound waves hit the ear, they cause tissue in the ear to start vibrating.

The ear consists of three major sections: the external ear, the middle ear, and the inner ear. The external ear acts like a small sound-collecting tube. Sound waves enter the ear and pass down a narrow canal called the auditory canal. At the end of the canal, the sound waves strike a thin membrane called the tympanic (pronounced tim-PA-nik) membrane, or ear drum. They cause the tympanic membrane to begin vibrating.

Just beyond the tympanic membrane is the middle ear. The middle ear contains three bones called ossicles (pronounced AH-sih-kulls). Vibration of the tympanic membrane is passed along to the ossicles. They too begin to vibrate.

The ossicles are connected to the inner ear. The inner ear is filled with a clear, watery fluid. As the ossicles vibrate, they create another wave inside the watery fluid in the inner ear. This wave is similar to a water wave on a lake or the ocean.

In the last stage of hearing, the water wave in the inner ear collides with the auditory nerve. The auditory nerve picks up these vibrations and transmits them to the brain. The brain "reads" these vibrations as a sound.