What's the difference between children's ears and adults' ears?

The ear canal structure of children and adults is different, not only the middle ear structure is not strong, but also the eustachian tube development is not perfect. The adult eustachian tube inclines inward, forward and downward from the tympanic orifice to the pharyngeal orifice, making an angle of about 40 degrees with the horizontal plane. The mouth of the tympanum is 2~2.5 cm higher than the pharynx, showing a funnel shape. It is the widest part of the inner diameter of the bone, about 4.5 mm, and then it becomes narrower and narrower inward.

In infancy, not only the structure of the middle ear is not firm, but also the development of the eustachian tube is not perfect. The eustachian tube is short and straight, and the lumen is relatively wide. The physiological stenosis of the eustachian tube has not yet formed, and the eustachian tube is not inclined like an adult, but is close to a horizontal position. In this way, the other end of the eustachian tube, that is, the open end of the nasopharynx, is almost flush with the bottom of the nose.

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