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.

Feb 7, 2022 · The petrous apex is the pyramid-shaped anteromedial part of the petrous part of the temporal bone. It is oriented obliquely in the skull base and articulates with the posterior aspect of the greater wing of the sphenoid and occipital bones.

The apex of the coccyx is rounded at the tip but still comes to somewhat of a point when you look at the overall bone, and it allows for the attachment of the tendon of the external anal sphincter. The apex can be split into two portions in some people.

Aug 26, 2023 · Apex: presents the anterior opening of the carotid canal and forms the postero-lateral border of the foramen lacerum

The petrous apex refers to a portion of the temporal bone situated approximately two to three inches in from the outer portion of the ear. Fluid-filled cysts, cholesteatomas , cholesterol granulomas, and other types of lesions may develop on …

The petrous apex is a difficult to reach surgical area due to its deep position in the skull base and many vital surrounding structures. Petrous apex pathology ranges from extradural cholesterol granulomas, cholesteatomas, asymmetric pneumatization, ...

Nov 5, 2024 · The petrous temporal bone has a pyramidal shape with an apex and a base as well as three surfaces and angles: apex (petrous apex) directed medially; articulates with the posterior aspect of the greater wing of the sphenoid and basilar occiput. forms internal border of the carotid canal and the posterolateral boundary of the foramen lacerum. base

For the petrous apex, bilateral nonpneumatized bone (Grade 0) was the most common variant, identified in 221 patients (46%). Seventy-four (15%) patients had bilateral pneumatization medial to the carotid artery (grade 3).

Background: Petrous apex cholesterol granulomas (PACGs) are benign inflammatory cystic lesions of the temporal bone. Usually, asymptomatic patients may develop symptoms as the lesions expand. The diagnosis is based on both CT and MRI scans and the management relies on “wait and scan” or surgery.

Mar 10, 2023 · The apex of petrous part is rough and uneven. It points medially, unlike the base of the wedge-shaped petrous bone, which extends outward and backward. The apex nestles into the angle formed by the posterior border of the greater wing of the sphenoid and the basilar part of the occipital bone.