The hairs are different lengths and each responds most at a particular pitch of sound (the pitch of a sound is its musical note). It is lined with special sensory cells called hair cells which are sensitive to sound. The cochlea is a snail-shaped chamber filled with fluid. The cochlea is involved with hearing, whilst the vestibular system helps with balance. The inner ear is made up of two components - the cochlea and the vestibular system. It can also allow infections like the common cold to spread from the throat and nose to the ears. The air space of the middle ear connects to the back of the nose by the Eustachian tube, a narrow tube which can let air in or out of the space. The last in the group, stapes, also makes contact with the inner ear. Inside it are the three smallest bones in the body, called malleus, incus and stapes. The middle ear is a small air-filled compartment which sits in the skull between the eardrum and the inner ear. The eardrum is a tightly stretched membrane, a bit like the skin of a drum. This separates the external ear from the middle ear. The outer (external) ear includes the part you can see (called the pinna) and the narrow tube-like structure - the ear canal. The ear is roughly divided into three parts.
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