What does the superior sagittal sinus do?
The superior sagittal sinus drains blood from cortical veins of the cerebral hemispheres, veins of the falx cerebri and meninges, diploic veins of the skull and emissary veins from the scalp. It empties into the confluence of sinuses in the occipital region.
What is superior sagittal sinus thrombosis?
Superior sagittal sinus thrombosis is a rare but serious condition presenting with symptoms and signs of raised intracranial pressure, such as headache, vomiting, and papilloedema. Convulsions and haemorrhagic cerebral infarction are well recognised complications.
What causes sinus confluence?
The confluence of sinuses (torcular herophili, or torcula) is the connecting point of the superior sagittal sinus, straight sinus, and occipital sinus. It is found deep to the occipital protuberance of the skull. Blood arriving at this point then proceeds to drain into the left and right transverse sinuses.
Where is the torcula in the brain?
The confluence of sinuses (torcular of Herophilus or torcula) is a dural venous sinus that appears as a dilation at the posterior end of the superior sagittal sinus. It is located on the caudal aspect of the brain, around the internal occipital protuberance of the occipital bone.
What does the superior sagittal sinus vein drain?
The superior sagittal sinus drains the lateral aspects of the anterior cerebral hemispheres. [4] The superior sagittal sinus eventually progresses posteriorly to the confluence of sinuses where it terminates.
What causes sagittal sinus thrombosis?
Collagen vascular diseases like lupus, Wegener’s granulomatosis, and Behcet syndrome. Obesity. Low blood pressure in the brain (intracranial hypotension) Inflammatory bowel disease like Crohn’s disease or ulcerative colitis.
Is sinus thrombosis a stroke?
CVST is a rare form of stroke. It affects about 5 people in 1 million each year. The risk for this kind of stroke in newborns is greatest during the first month.
What is significance of confluence in brain?
Function. The confluence of sinuses is important in drainage of venous blood from the brain. It drains most of the blood from the brain.
What are brain sinuses?
The dural venous sinuses (also called dural sinuses, cerebral sinuses, or cranial sinuses) are venous channels found between the endosteal and meningeal layers of dura mater in the brain.
What does superior petrosal sinus drain into?
The function of the superior petrosal sinus is to drain the venous blood from the brainstem, temporal lobe of cerebrum, cerebellum, middle and inner ear into the transverse sinus….Superior petrosal sinus.
| Drains from | Cavernous sinus |
|---|---|
| Tributaries | Superior petrosal, cerebellar, inferior cerebral, tympanic, labyrinthine veins |
Where does superior sagittal sinus drain?
Is dural venous sinus the same as superior sagittal sinus?
Thus, the dural venous sinuses contain blood and the paranasal sinus contain air. The various dural venous sinus are now described. The superior sagittal sinus is found in the upper border of the falx cerebri and begins at the crista galli.
What causes sinus thrombosis?
Cavernous sinus thrombosis is usually caused by a bacterial infection that spreads from another area of the face or skull. Many cases are the result of an infection of staphylococcal (staph) bacteria, which can cause: sinusitis – an infection of the small cavities behind the cheekbones and forehead.
What is a cavernous sinus?
The cavernous sinus is part of the brain’s dural venous sinus and contains multiple neuro-vasculatures. It is situated bilaterally to the sella turcica and extends from the superior orbital fissure anteriorly to the petrous part of the temporal bone posteriorly, and is about 1 cm wide and 2 cm long.
What is the superior sagittal sinus?
The superior sagittal sinus is an unpaired sinus that runs through the groove for superior sagittal sinus. This groove spans across the midline on the internal surface of the calvaria.
What are the possible findings of distal superior sagittal sinus (SSS)?
Potential findings include: a potential pitfall is interpreting the distal superior sagittal sinus as being hyperdense near the torcular herophili With contrast administration, especially with a CT venogram, a filling defect in the sinus is sought.
Where are superior sagittal sinus DAVFs supplied from?
(Used with permission from Barrow Neurological Institute, Phoenix, Arizona.) Superior sagittal sinus dAVFs are usually supplied from middle meningeal artery branches. They can be approached via a craniotomy on the same side as the fistula.
Where does the superior sagittal sinus drain blood?
The superior sagittal sinus drains blood from cortical veins of the cerebral hemispheres, veins of the falx cerebri and meninges, diploic veins of the skull and emissary veins from the scalp. It empties into the confluence of sinuses in the occipital region.