Tags: Anatomical Structure, Bone.
The petrous portion of the temporal bone or pyramid is pyramidal 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 for examination a base an apex three surfaces and three angles and contains in its interior the essential parts of the organ of hearing. The petrous portion is among the most basal elements of the skull and forms part of the endocranium.
