Fill in the Blanks Ear Structure Fill in the BlanksOnline version Test your knowledge of the ear's anatomy by filling in the blanks in this interactive game! by Khadeeja Amjad 1 ear brain outer ear cochlea vestibular system balance middle ear ear canal pinna inner ear electrical signals sound waves eardrum ossicles hearing The is divided into three parts : the , , and . The outer ear consists of the and . The middle ear contains the and three small bones called . The inner ear contains the , which is responsible for , and the , which helps with . Sound waves enter the ear through the outer ear and travel down the ear canal to the eardrum . The eardrum vibrates , causing the ossicles to move . This movement sends the to the cochlea , where they are converted into that are sent to the .