Your ear is divided into three parts: an external ear, middle ear and an inner ear. The external ear and the middle ear conduct and transform sound; the inner ear receives it.
The external ear consists of the auricle and ear canal. These structures gather sound and direct it toward the ear drum.
The middle ear consists of the ear drum and three small bones: malleus (hammer), incus (anvil), and stapes (stirrup). These structures transmit sound vibrations to the inner ear.
The inner ear is a fluid-filled cavity. Vibrations in this fluid stimulate the acoustic nerve (hearing nerve). The acoustic nerve then carries the sound waves to the brain where they are interpreted as understandable sounds.