What is skull asterion?
What is skull asterion?
The asterion is an anatomical landmark on the lateral aspect of the skull formed at the junction of the occipital bone, the temporal bone, and the parietal bone.
What sutures meet at the asterion?
It is the point where three cranial sutures meet: the lambdoid suture. parietomastoid suture. occipitomastoid suture.
What is pterion and asterion?
The pterion and asterion are at the outer surface of the skull. The pterion is the region where the frontal, sphenoid, parietal and temporal bones join together, and the asterion is the intersection of parietal, temporal and occipital bones. The sutural pattern of both are different in the various population and races.
What is pterion anatomy?
The pterion which marks the union of 4 bones of the cranium is located superior to the zygomatic arch and posterior to the frontozygomatic suture. It is an important neurosurgical landmark for the lateral/pterional approach and has racial differences in both its location and pattern of union of the bones.
Where is the jugular foramen?
The jugular foramen is situated in an oblique plane along the skull base. Its boundaries include the petrous temporal bone anterolaterally and the jugular process of the occipital condyle posteromedially. The jugular foramen is usually larger on the right than on the left.
What is magnum foramen?
The foramen magnum is the largest foramen of the skull. It is located in the most inferior portion of the cranial fossa as a part of the occipital bone.
What is Metopic suture?
The metopic suture (also known as the frontal, interfrontal, or median frontal suture) is a vertical fibrous joint that divides the two halves of the frontal bone and is present in a newborn.
What 4 bones meet at the pterion?
The pterion is a craniometric point near the sphenoid fontanelle of the skull. It is a point of convergence of the sutures between the frontal, sphenoid, parietal, and squamous temporal bones [1]. There are varied patterns of articulation of these bones and sometimes a small epipteric bone may be present.
What does pterion mean?
Medical Definition of pterion : the point on each side of the skull where the parietal and temporal bones meet the greater wing of the sphenoid.
What 2 bones border the jugular foramen?
The jugular foramen is a cavity formed by the petrous part of the temporal bone anteriorly and the occipital bone posteriorly.
What divides jugular foramen?
The jugular foramen is usually divided in 2 portions (6): The pars nervosa, housing the glossopharyngeal nerve and its tympanic branch (Jacobson’s nerve), the inferior petrosal sinus and the meningeal branches of the ascending pharyngeal artery; and the pars vascularis, containing the sigmoid sinus, vagus (and its …
What is Forum and Magnum?
The foramen magnum (Latin: great hole) is a large, oval-shaped opening in the occipital bone of the skull. It is one of the several oval or circular openings (foramina) in the base of the skull. The spinal cord, an extension of the medulla oblongata, passes through the foramen magnum as it exits the cranial cavity.
What passes from foramen magnum?
The foramen magnum functions as a passage of the central nervous system through the skull connecting the brain with the spinal cord. On either side of the foramen magnum is an occipital condyle. These condyles form joints with the first cervical vertebra.
Where is the squamosal suture?
The squamosal or squamous suture is the cranial suture between the temporal and parietal bones bilaterally. From the pterion, it extends posteriorly, curves inferiorly and continues as the parietotemporal suture.
What is beneath pterion?
Haematoma. The pterion is known as the weakest part of the skull. The anterior division of the middle meningeal artery runs underneath the pterion. Consequently, a traumatic blow to the pterion may rupture the middle meningeal artery causing an epidural haematoma.
What sutures make the pterion?
Pterion involves three cranial sutures:
- Sphenoparietal suture.
- Coronal suture.
- Squamous suture.
Where is pterion of the skull?
Why is pterion clinically significant?
The pterion is known as the weakest part of the skull. Clinically, the pterion is relevant because the middle meningeal artery runs beneath it, on the inner side of the skull, which is quite thin at this point. A blow to the pterion (e.g. in boxing) may rupture the artery causing an extradural haematoma.
