The human ear structure is mainly composed of three parts, namely the outer ear, the middle ear and the inner ear.Each structure has a different composition and physiological function.
1. Outer ear:
The external ear mainly includes the auricle and the external auditory canal.The external auditory canal is “S” with a length of 2.5-3.5 cm.Because the ear canal has a curvature, it is possible for the customized machine to be inserted into the ear, and make sure Hearing aid Does not fall out in the ears.For example, turning the head, running, squatting and jumping, etc., the customized machine is not easy to fall.
The physiological functions of the outer ear mainly include: sound collection, sound source location (the time difference and intensity difference between sound transmission into the ears), the transmission of sound to the middle ear, and the pressurization of sound waves.
2. Middle ear:
In the middle ear structure, there are mainly three bones (malvulus-incus-stapes), the ossicular chain.The tympanic membrane is a transparent membrane with a reflective area that protects the middle ear from water and insects entering the middle ear.
Common diseases of the middle ear include: otitis media (secretory otitis media, suppurative otitis media, ossicular chain interruption/fixation, tympanic membrane perforation, etc.)
3. Inner ear:
The inner ear structure is mainly composed of the cochlea and vestibule.The main function of the inner ear is to convert energy, which converts the sound and vibration from the middle ear into bioelectricity.