The following table summarizes the differences between the eustachian tube of an infant and an adult
Infant | Adult | |
Length | 18 mm | 36 mm |
Direction | More or less horizontal (makes an angle of 10° with the horizontal plane) | Oblique, directed downwards, forwards and medially (makes an angle of 45° with the horizontal plane) |
Angulation of isthmus | No angulation | Angulation present |
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