The external auditory canal is a blind tube that starts from the outer ear door of the auricular cavity and ends at the tympanic membrane and extends into the temporal bone, with a length of about 2.5-3.5 cm, consisting of cartilaginous and bony parts. The external auditory meatus, the entrance to the external auditory canal, is located on the dorsal side of the ear screen. The external auditory canal is responsible for connecting the external auditory meatus to the tympanic membrane. The outer 1/3 of the canal is a cartilaginous portion, which is connected to the cartilage of the auricle, and the inner 2/3 of the canal is a bony portion, which is an oval-shaped canal. The external auditory canal is relatively curved, extending from the outside to the inside first toward the top and then continuing backward and downward. The surface of the external auditory canal is covered with a layer of skin containing nerves and glands. Because there is relatively little subcutaneous tissue in the external auditory canal, the external auditory canal can be intensely painful if it becomes septic. There are glands in the external auditory canal that secrete fluid to form cerumen, which can affect hearing if it clumps and becomes blocked.