What are the parts of the temporal bone?
The temporal bone is divided into several main parts/portions 1-3:
- squamous part (temporal squama)
- petrous part (petrous pyramid)
- tympanic part.
- mastoid part (usually considered a separate part but it is formed by both the squamous and petrous parts)
Where is the tegmen Mastoideum located?
Middle Ear and Mastoid The tegmen refers to a thin plate of bone that separates the dura of the middle cranial fossa from the middle ear and the mastoid cavity. The tegmen tympani is the roof of the middle ear, and the tegmen mastoideum is the roof of the mastoid (Figs 4, 5).
What type of bone is the temporal bone?
The temporal bone is a thick, hard bone that forms part of the side and base of the skull. This bone protects nerves and structures in the ear that control hearing and balance.
Which area is part of the temporal bone?
The temporal bones are situated at the sides and base of the skull, and lateral to the temporal lobes of the cerebral cortex. The temporal bones are overlaid by the sides of the head known as the temples, and house the structures of the ears….
|Anatomical terms of bone|
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; …
What is the temporal bone CT scan and what does it show?
Temporal bone CT is a limited kind of head CT that focuses on the lower part of the skull and the surrounding soft tissues, and is often used in patients with hearing loss, chronic ear infections, and middle and inner ear diseases.
What is the tegmen Mastoideum?
The bony roof of mastoid sinuses. Advertisement.
What is a tegmen defect?
A tegmen tympani defect is a tear in either the right or left side of the tegmen tympani, or the roof of the middle ear, which disrupts communication between the intracranial and extracranial sections. Any delay in diagnosis increases the risk of seizures, meningitis, encephalitis, or cerebral abscess.
Why is temporal bone called temporal?
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.
Which bone is superior to the temporal bone?
The temporal bone articulates anteriorly with the sphenoid bone, above with the parietal bone, and posteriorly with the occipital bone.
What is the anatomy of the temporal bone?
The anatomy of the temporal bone is complex and is further complicated by the small size and three-dimensional orientation of associated structures. Computed tomography (CT) has revolutionized imaging of the temporal bone.
What is the modality of choice for evaluation of temporal bone trauma?
While high-spatial-resolution temporal bone computed tomography (CT) is the modality of choice for evaluating temporal bone trauma, particularly fractures, CT arteriogram/venogram or magnetic resonance (MR) arteriogram/venogram and high-spatial-resolution MR imaging may be helpful for the assessment of complications.
What are the 5 osseous bones of the temporal bone?
The temporal bones comprise the lateral skull base, forming portions of the middle and posterior fossae. Each temporal bone is composed of five osseous parts: the squamous, mastoid, petrous, tympanic, and styloid portions.
What is the best way to learn about the temporal bone?
An interactive Web-based learning module on the temporal bone has been developed. It shows normal temporal bone anatomy in four imaging planes: axial, coronal, and parallel and perpendicular to the long axis of the petrous bone.