The following table summarizes the differences between the eustachian tube of an infant and an adultInfant 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
isthmusNo angulation Angulation present
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