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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.
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 ...
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In the temporal bone, the mandibular fossa is bounded anteriorly by the articular tubercle and posteriorly by the tympanic portion of the temporal bone, which separates it from the external acoustic meatus. The fossa is divided into two parts by a narrow slit, the petrotympanic fissure (Glaserian fissure).
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.
Dorello's canal is a bow-shaped bony enclosure at the tip of the petrous part of the temporal bone. [2] It is fairly short. [3] Dura mater forms a sleeve within Dorello's canal, forming an outer wall. [3] There may also be arachnoid mater. [3] This contains the abducens nerve (VI) and the inferior petrosal sinus. [2] [3]
The superior petrosal sinus is located beneath the brain. It originates from the cavernous sinus.It passes backward and laterally to drain into the transverse sinus.. The sinus runs in the attached margin of the tentorium cerebelli, in a groove in the petrous part of the temporal bone formed by the sinus itself - the superior petrosal sulcus.