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Point of decussation of the optic nerves
- It represents the point of decussation of the optic nerves, where the nasal fibers of each eye cross the midline to join the temporal fibers of the contralateral eye.
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What are the different parts of the temporal bone?
What is the structure and landmarks of the temporal bone?
What is the major structure of the temporal region?
What is the petrous part of the temporal bone?
Aug 26, 2023 · The temporal bones are a pair of bilateral, symmetrical bones that constitute a large portion of the lateral wall and base of the skull. They are highly irregular bones with extensive muscular attachments and articulations with surrounding bones.
Jun 5, 2023 · The term "temporal" region of the skull and the "temporal" bone specifically comes from the Latin word tempus or time. Grey hairs first appear in the temporal area in males, thus a mark of age or time. Another term for the temporal bone is the petrous pyramid, from the Latin petrosal or hard.
- Anatomy
- Function
- Associated Conditions
- Rehabilitation
Structure & Location
In anatomy, each temporal bone is composed of five parts: the squama, the petrous, mastoid, and tympanic parts, as well as the styloid process.Here’s a quick breakdown: 1. Squama: Forming the front, upper part of the temporal bone, the squama is thin, translucent, and described as “scale-like.” The outer surface is smooth and forms a convex shape, and, via the temporal line (a curved ridge running to the back and upward), it attaches to the temporalis muscle, which helps with chewing. The fro...
Anatomical Variations
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: 1. High Riding Jugular Bulb: This is when the jugular bulb, a vein structure located near the inner ear, ascends higher into the temporal bone than usual. This asymptomatic variation is important for surgeons operating on the inner ear to note, and it’s been reported to occur in up to 32% of cases. 2. Körner’s Septum...
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. Notably, a majority of the cranial nerves—nerves a...
A number of medical issues can arise in this part of the skull. While the temporal bone is relatively thick, blunt trauma can cause a fracture of this bone. This can lead to a number of serious complications, including damage to hearing, vertigo, facial paralysis (due to damage to the facial nerve), and bleeding in the ear as well as bone bruising....
Depending on the severity of trauma and fracture of the skull, surgery may be necessary to correct the issue and take on bleeding and other issues that may arise. If there’s damage to the facial nerve, as is often the case, a nerve decompression surgery may be necessary to repair it and ease pressure on it. This, along with more conservative approa...
- Anterior View of Skull. The anterior skull consists of the facial bones and provides the bony support for the eyes and structures of the face. This view of the skull is dominated by the openings of the orbits and the nasal cavity.
- Lateral View of Skull. A view of the lateral skull is dominated by the large, rounded brain case above and the upper and lower jaws with their teeth below (Figure 7.5).
- Bones of the Brain Case. The brain case contains and protects the brain. The interior space that is almost completely occupied by the brain is called the cranial cavity.
- Sutures of the Skull. A suture is an immobile joint between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones.
Sep 24, 2020 · Definition. The temporal bone or os temporale is a paired, irregular bone and the thickest in the human body, located at the sides and base of the skull. It provides space for important cranial arteries, veins, and nerves. The os temporale also provides attachment points for numerous muscles.
Dec 15, 2022 · Anatomical Structure. The temporal bone itself is comprised of five constituent parts. The squamous, tympanic and petromastoid parts make up the majority of the bone, with the zygomatic and styloid processes projecting outwards. Fig 1.1 – The constituent parts of the temporal bone.
