sound comes from the outer ear and ear canal to the eardrum justified. It is therefore vibrate. The eardrum forms the transition from the ear canal to the middle.

consists of the tympanic cavity, which is normally filled with air, which via the Eustachian tube is in communication with the throat. In the tympanic cavity is a chain of three ossicles (hammer, anvil and stirrup). The main function of the middle ear is the amplification of sound, so it can be better observed by the hair cells located in the inner ear.

is due to its spiral shape called the cochlea. It is about 4 inches long, two and a half times rolled and filled with fluid. This liquid is put into motion by sound vibrations via the 'base' of the stapes, which forms the lid of the oval window. The vibrations pass through the cochlea and arrive at the round window. In the cochlea is the basilar membrane, in which about 20,000 hair cells.

is close to the cochlea, including the vestibular system. Together these two are also known as the labyrinth mentioned. Despite being functionally different systems, both are closely linked and they use the same fluids and give their signals through the same brain nerve to the brains.


Man Gay sapiens or a bipedal primate species in the family Hominidae. Research suggests that modern humans about 200,000 years ago in Africa emerged as a species. Humans have highly developed brains, which he is capable of abstract thinking, language, introspection, problem solving and emotion. Thanks to his intelligence and upright posture, allowing the arms to be free to pick up objects and manipulate, the man much more than other species able to use tools.