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The outer shell of the labyrinth of the inner ear is hard and resembles ivory, known as the "bone labyrinth." The bone labyrinth contains a membrane labyrinth that is roughly similar in shape. There is external lymph fluid between the bone labyrinth and the membrane labyrinth. The membrane labyrinth contains internal lymph fluid, which does not have direct communication with the outside world, making the membrane labyrinth a blind tube system. The external lymph fluid drains into the subarachnoid space of the brain, which is connected to the cerebrospinal fluid. In fact, the membrane labyrinth is suspended in the external lymph fluid cavity of the bone labyrinth, but it is fixed to the walls of the bone labyrinth by many fibrous bands.