The parts which function together to bring about hearing are labelled

The parts which function together to bring about hearing are labelled as I, II, III and IV. These labels refer to the different structures in the ear that work together to allow us to hear sound. Label I refers to the outer ear, which collects sound waves and directs them towards the middle ear (II). Label III represents the inner ear, which contains the cochlea and the vestibular system responsible for balance, as well as the auditory nerve. Finally, label IV is the auditory cortex in the brain, which processes and interprets the sounds we hear. Therefore, all the parts of the ear involved in hearing, from the outer ear to the brain, are necessary for the sense of hearing to function properly.