What canals pass through the pyramid of temporal bone?
On the upper surface of the pyramid the anterior semicircular canal forms the eminentia arcuata and behind on the medial wall of the tympanic cavity and aditus ad antrum the lateral semicir- cular canal forms a projection, the prominence of the horisontal canal.
What are the 5 important bone markings on the temporal bone?
Each consists of five parts, viz., the squama, the petrous, mastoid, and tympanic parts, and the styloid process. The Squama (squama temporalis). —The squama forms the anterior and upper part of the bone, and is scale-like, thin, and translucent.
Why would a fracture in the anterior temporal bone?
Temporal bone trauma is usually the result of blunt head injury and patients commonly suffer from multiple other body injuries. Motor vehicle accidents are the most common cause, with falls and gunshot wounds contributing to a lesser extent.
What is temporal bone dissection?
The temporal bone dissection procedure involves harvesting the bone from a human cadaver and storage in formaldehyde. It is mounted securely in a bone holder in the same position as in actual surgery and dissected using a surgical microscope and a micromotor drill.
How many canals are in the temporal bone?
The temporal bone is ossified from eight centers, exclusive of those for the internal ear and the tympanic ossicles: one for the squama including the zygomatic process, one for the tympanic part, four for the petrous and mastoid parts, and two for the styloid process.
What are the markings of the temporal bone?
Terms in this set (12)
- Squamous part. Located inferior to the squamous suture.
- Zygomatic process. Located at squamous part; a bridge like projection that articulates with the zygomatic bone.
- Mandibular fossa.
- Tympanic part.
- External acoustic meatus.
- Styloid process.
- Petrous part.
- Jugular foramen.
What is the bone marking of the temporal bone?
Learning Objectives
| Bone Markings (Table 7.2) | ||
|---|---|---|
| Marking | Description | Example |
| Fovea | Small pit | Fovea capitis on the head of the femur |
| Sulcus | Groove | Sigmoid sulcus of the temporal bones |
| Canal | Passage in bone | Auditory canal |
Where are the temporal bones?
The temporal bones are two major bones in the skull, or cranium. They help form the sides and base of the skull, where they protect the temporal lobe of the brain and surround the ear canal. The other major bones in the skull are: the two parietal bones that make up the top of the skull.
Does temporal bone dissection use a microscope?
We compared dissection times with USB microscope versus standard surgical microscope only observing that using USB microscope, temporal bone dissection can be carried out within reasonable time.
Can a tumor be removed from the temporal bone?
If the tumor involves the inner 2/3 of the ear canal (bony ear canal) then a lateral temporal bone resection has to be performed. This involves removing the entire ear canal, ear drum and the first 2 bones behind the ear drum. In addition removal of the parotid gland (saliva gland in front of the ear) and lymph nodes from the neck may be necessary.
How does the temporal bone support the skull?
The temporal bone provides structural support for the skull, while protecting the cerebrum of the brain and surrounding membranes. In addition, this bone surrounds the middle and inner portions of the ear. Its lower portion connects with the mandible or jawbone to allow the mouth to open and close.
Are there any variations in the temporal bone?
Variations in the anatomy of the temporal bone are not uncommon and usually have to do with the size and shape of its many openings. The most commonly observed variations are:
How is the temporal bone connected to the stylohyoid?
Variable in length, it is angled downward and forward, accessing on the inner side the tympanic part that encloses it, and on the outer side to ligaments that connect to the stylohyoid and other muscles involved with chewing motions.