Petrous part of the temporal bone

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Petrous part of the temporal bone”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Anatomography, CC BY-SA 2.1 jp, via Wikimedia Commons.