(20 12? Ear is an important sensory organ of human body, and hearing is an important way for people to obtain information. The following is the structural pattern diagram of the ear, please refer to it. (1)(2)(3) The structure of the ear includes the outer ear, the middle ear and the inner ear. The external ear includes ① auricle and ② external auditory canal, which have the functions of collecting sound waves and transmitting sound waves respectively. The middle ear consists of ⑦ eardrum, tympanum and ⑦ ossicles. The role of the eardrum is to produce vibration when sound waves are transmitted. There are mainly three ossicles in the tympanic cavity, which mainly transmit the vibration generated by the tympanic membrane to the inner ear. The inner ear is divided into three parts: ⑤ cochlea, ⑤ vestibule and ⑤ semicircular canal. The cochlea contains auditory receptors, and the vestibule and semicircular canal contain position (balance) receptors that feel the change of head position. Human hearing is formed in the auditory pathway of cerebral cortex.

(4) The pharynx and tympanum are connected by the eustachian tube. If a person catches a cold, bacteria in the throat will enter the middle ear through the eustachian tube, causing otitis media.

(5) People can recover their hearing through hearing AIDS, which means that the eardrum of this person is sick, but the cochlea is fine.

So the answer is: (1)⑦ tympanic membrane; 6 ossicles; (2)③ semicircular canal; ④ Vestibule; (3)⑤ Cochlea; Auditory pathways in the cerebral cortex; (4) in; (5)⑤.