Pyramid of the Temporal Bone [Pars Petrosa, Pna; Pars Petrosa (Pyramis), Bna; Syn. Petrous Part of the Temporal Bonus]

The pyramid of the temporal bone (pars petrosa) is the inner part of the temporal bone. It has the shape of a triangular pyramid. The apex of the pyramid is directed forward and medially. Inside the pyramid are the inner and middle ear and the facial and vestibulocochlear nerves. The pyramid of the temporal bone is an important structure that ensures normal hearing and balance.