ATV refers to All Terrain Vehicle. It is also known as three wheeler, four wheeler, quadricycle, quad and quadbike. They are used by single operators. It is designed in such a way that it can handle wider variety of terrain.
The cochlea is the sense organ that translates sound into nerve impulses to be sent to the brain. Each person has two cochlea, one for each ear. The cochlea is a fluid-filled, snail shaped cavern in the mastoid bone of your skull behind each ear. Tiny bones in the middle ear transmit sound from the eardrum across the middle ear and vibrate against the cochlea.
The cochlea is a spiral structure containing cilia (hair-like structures) and fluids that flow throughout the inner ear to help with the detection of the body orientation and sound transmission to the brain. All the cilia in the cochlea are connected to the brain via the auditory nerve.