What is the Pars petrosa?
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.
What are 3 borders of pyramid?
It has a base, an apex and three surfaces: anterior, posterior and inferior. It also has three borders: superior, anterior and posterior.
What muscles attach to the temporal bone?
Externally, the squamous portion of the temporal bone is smooth and provides attachment for the temporalis fascia and muscle at the superior and inferior temporal lines, respectively. The zygomatic process, which has an anterior and posterior root, extends anteriorly and articulates with the zygomatic bone.
Why is the temporal bone named temporal bone?
Etymology. Its exact etymology is unknown. It is thought to be from the Old French temporal meaning “earthly,” which is directly from the Latin tempus meaning “time, proper time or season.” Temporal bones are situated on the sides of the skull, where grey hairs usually appear early on.
What does the temporal bone do?
The temporal bone surrounds the ears and protects nerves and structures that play a role in controlling hearing and balance. Sound enters the ear canal and makes the tiny bones (ossicles) inside the ear vibrate.
Where is the temporal bone in the ear?
Temporal bones are located at the sides and base of the skull. The temporal bone in the ear area contains the middle and inner portions of the ear.
What are the key landmarks of the temporal bone?
The surface landmarks on the squamous portion: 1, temporal fossa; 2, supra-meatal crest; 3, temporal line; 4, external acoustic meatus; 5, supra-meatal triangle (Macewen’s triangle); 6, middle temporal artery; 7, squamo-mastoid suture; 8, mandibular fossa (glenoid fossa); 9, articular eminence; 10, zygomatic process; …
Where is the temporalis muscle?
The temporalis muscle attaches above to the bone and fascia in the temporal fossa, superior to the zygomatic arch, and below to the coronoid process of the mandible and along the mandibular ramus (Figure 6-17). The temporalis muscles primarily close the jaw while the middle fibers bilaterally retrude the mandible.
Why does my temporal bone hurt?
What are the causes & diagnosis of Temporalis Tendonitis? stress, tooth grinding, direct trauma to the Temporalis muscle, excessive gum chewing. In rare cases a condition called Coronoid Process Hyperplasia may be the cause of Temporal Tendinitis.
What happens if the temporal bone is damaged?
A temporal bone fracture may cause facial paralysis, hearing loss, bruising behind the ear, and bleeding from the ear. Doctors use computed tomography (CT) to diagnose temporal bone fractures. Treatment, sometimes including surgery, is needed if the fracture causes problems.