Where is the hypoglossal canal located?
Occipital Condyle
Introduction. Hypoglossal Canal (HC) is a paired bony passage which is situated above the Occipital Condyle (OC) and transmits hypoglossal nerve and blood vessels.
Where is jugular foramen located?
On its extracranial surface, the jugular foramen has an oblique course from medial to lateral and from posterior to anterior, and it is located posterior to the carotid canal, anterolateral to the occipital condyle, and medial to the styloid process (Figure 1B).
Does the hypoglossal canal pass through the foramen magnum?
When viewing the skull inferior to superior from an extracranial aspect, the foramina exists lateral to the occipital condyles. Closely medial to the jugular foramen sits the hypoglossal canal, which itself is directly lateral to the foramen magnum bilaterally.
Where is the jugular foramen located and which structure passes through it?
The jugular foramen is a large foramen (opening) in the base of the skull, located behind the carotid canal. It is formed by the temporal bone and the occipital bone. It allows many structures to pass, including the inferior petrosal sinus, three cranial nerves, the sigmoid sinus, and meningeal arteries.
Where is the foramen ovale located in the skull?
sphenoid bone
The foramen ovale is an oval shaped opening, placed obliquely in the base of the skull. It is situated in the greater wing of sphenoid bone, close to the upper end of posterior margin of lateral pterygoid plate, medial to foramen spinosum and lateral to the foramen lacerum [1].
Why is it called hypoglossal canal?
The hypoglossal canal is a foramen in the occipital bone of the skull. It is hidden medially and superiorly to each occipital condyle. It transmits the hypoglossal nerve….
| Hypoglossal canal | |
|---|---|
| Occipital bone. Inner surface. | |
| Details | |
| Part of | occipital bone |
| System | skeletal |
Where is carotid canal?
petrous temporal bone
Background: The carotid canal (CC) located in the petrous temporal bone transmits the internal carotid artery, internal carotid venous plexus and sympathetic nerve plexus from the neck into the cranial cavity.
What is a jugular foramen in anatomy?
The jugular foramen is a large aperture in the base of the skull. It is located behind the carotid canal and is formed in front by the petrous portion of the temporal, and behind by the occipital; it is generally larger on the right than on the left side.
What passes through hypoglossal canal?
Function. The hypoglossal canal transmits the hypoglossal nerve from its point of entry near the medulla oblongata to its exit from the base of the skull near the jugular foramen.
What passes through the foramen magnum?
…a large oval opening, the foramen magnum, through which the medulla oblongata passes, linking the spinal cord and brain.
What passes through the optic foramen?
The optic foramen, the opening through which the optic nerve runs back into the brain and the large ophthalmic artery enters the orbit, is at the nasal side of the apex; the superior orbital fissure is a larger hole through which pass large veins and nerves.…
Where is the foramen ovale located quizlet?
The foramen ovale is a hole in the atrial septum during fetal life that alows the blood to skip the lungs and go straight through to the aorta. The foramen ovale becomes the fossa ovalis in adults.
Where are the roots of the hypoglossal canal located?
These roots merge within the canal and a single nerve emerges. The hypoglossal canal is most easily identified on axial or coronal images through the occipital condyles, where it can be seen passing anterolaterally from the posterior fossa into the upper neck.
Which is the hole closest to the foramen magnum?
Hypoglossal canal: This hole is the one closest to the foramen magnum. It allows passage of the twelfth cranial nerve (CNXII), the hypoglossal nerve. As with the glossopharyngeal, the hypoglossal nerve is associated with the tongue, and provides innervation to all but one of the muscles of the tongue.
Where are the nerves located in the jugular foramen?
The jugular foramen is positioned below the internal acoustic meatus and superolateral to the hypoglossal nerves entering the hypoglossal canal. The glossopharyngeal, vagus, and accessory nerves enter the dural roof of the jugular foramen.
Is the vagus nerve adherent to the foramen?
The glossopharyngeal nerve is often adherent to the rootlets of the vagus nerve in the cistern, however, at the roof of the jugular foramen, there is consistently a dural septum separating the glossopharyngeal from the vagus nerve. The glossopharyngeal nerve enters a shallow meatus, the glossopharyngeal meatus, in the dural roof of the foramen.