Cochlea Cochlea The cochlea is the part of the inner ear involved in hearing. It is a spiral-shaped cavity in the bony labyrinth, in humans making 2 turns(full) and a 3/4(3 quarters) turn around its axis, the modiolus. A core component of the cochlea is the Organ of Corti, the sensory organ of hearing, which is distributed along the partition separating fluid chambers in the coiled tapered tube of the cochlea. The name cochlea derives . The cochlea (plural is cochleae) is a spiralled, hollow, conical chamber of bone, in which waves propagate from the "base" (near the middle ear and
Evolution of the cochlea motor function in land vertebrates, but this developed vastly differently in different lineages. In certain birds and mammals, prestins function as both transporters and motors, but the strongest evolution to robust motor dynamics only evolved in therian mammals. It is hypothesized that this motor system is significant to the therian cochlea at high frequencies because of the distinctive cellular and bony composition of the organ of Corti that allows the prestins to intensify movements of the whole structure. Modern ultra-sound echolocating species such as bats and toothed whales show highly evolved prestins, and these prestins show identical sequence alterations over