The ectotympanic, or tympanicum, is a bony structure found in all mammals, located on the tympanic part of the temporal bone, which holds the tympanic membrane (eardrum) in place.
In catarrhine primates (including humans), it takes a tube-shape.
[1][2] Its position and attachment to the skull vary between primates, and can be either inside or outside the auditory bulla.
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