Vestibular System Embryology

The internal ear, sometimes called the labyrinth of the ear, is where a person’s hearing and balancing systems are located. The inner ear consists of the vestibule, cochlea, and semicircular canals. The semicircular canals detect rotating motions, whereas the vestibule detects linear acceleration. Corti’s organ in the cochlea converts acoustic impulses into neural impulses transmitted to the brain through the vestibulocochlear nerve. To transfer sound and detect movement, the exterior, intermediate, and internal auditory structures must coordinate their sensitive functions. Ear development is complex and extensive, involving all three germ layers and a long process of embryonic patterning. Different developmental mechanisms give rise to the typical morphology of each anatomical division of the ear. A fetus can hear at a functional level by approximately 26 weeks of gestation, while ear development continues after delivery. Disruptions to normal developmental processes can cause various congenital disabilities and abnormalities in anatomy.