8 cranial bones 4 calvaria and 4 floor. The internal ear lying within the densest portion of the petrous pyramid of the temporal bone. The petrous part of the temporal bone is pyramid shaped and is wedged in at the base of the skull between the sphenoid and occipital bones directed medially forward and a little upward it presents a base an apex three surfaces and three angles and houses in its interior the components of the inner ear the petrous portion is among the most basal elements of the skull and forms part of.
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