The labyrinth of the inner ear Cajal was was interested in other organs, such as the inner ear. The organ of Corti, which converts sounds into electrical signals, is shown in a and b. The semicircular canals, the structures that detect rotation of the head, are shown in E and F, while the otolith, the structure that senses movement and tilting of the head, is shown in D. The neurons that transmit this information to the brain are indicated by A and B