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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 and mastoid parts of the temporal bone, which derive from the periotic bone, formed from the fusion of a number of bones surrounding the ear of reptiles. The delicate structure of the middle ear , unique to mammals, is generally not protected in marsupials , but in placentals , it is usually enclosed within a bony sheath called the ...
The petrosal process is a sharp process below the notch for the passage of the abducent nerve on either side of the dorsum sellae of the sphenoid bone.It articulates with the apex of the petrous portion of the temporal bone, and forms the medial boundary of the foramen lacerum.
The greater petrosal nerve enters the petrous part of the temporal bone and travels anteromedially through it at a 45° angle. It emerges into the middle cranial fossa upon the anterosuperior surface of the bone [1]: 498 through the hiatus for greater petrosal nerve alongside the petrosal branch of the middle meningeal artery. [3]: 842
At the posterior lateral wall of the temporal bone is the vestibular aqueduct, which extends to the posterior surface of the petrous portion of the temporal bone. [1] The vestibular aqueduct parallels the petrous apex, in contrast to the cochlear aqueduct, which lies perpendicular to the petrous apex.
The petrosquamous suture is a cranial suture between the petrous portion and the squama of the temporal bone. It forms the Koerner's septum. The petrous portion forms the medial component of the osseous margin, while the squama forms the lateral component.
Petrous portion (From Latin petrous 'rocky') may refer to: Petrous portion of the temporal bone; Petrous portion of the internal carotid artery
Viewing the petrous bone, bony labyrinth and internal auditory canal Within the medical field of otology , the Stenvers projection is a radiological technique that provides an oblique view of the skull and establishes a better perspective on the petrous bone , bony labyrinth , and internal auditory canal . [ 1 ]