Definition: a large irregular bone situated in the base and side of the cranium; it consists of three parts, squamous, tympanic, and petrous, which are distinct at birth; the petrous part contains the vestibulocochlear organ; the bone articulates with the sphenoid, parietal, occipital, and zygomatic bones, and by a synovial joint with the mandible.
Synonym(s): os temporaleTA
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