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before birth; the petromastoid part and squama join during the first year, and the tympanohyal portion of the styloid process about the same time [Fig. 7, 8]. The stylohyal does not unite with the rest of the bone until after puberty, and in some skulls never at all.

Postnatal development

Apart from size increase, the chief changes from birth through puberty in the temporal bone are as follows:
# The tympanic ring extends outward and backward to form

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