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The superior sagittal sinus (also known as the superior longitudinal sinus), within the human head, is an unpaired dural venous sinus lying along the attached margin of the falx cerebri. It allows blood to drain from the lateral aspects of the anterior cerebral hemispheres to the confluence of sinuses.
Cranial venous sinuses communicate with veins outside the skull through emissary veins. These communications help to keep the pressure of blood in the sinuses constant. The major dural venous sinuses included the superior sagittal sinus, inferior sagittal sinus, transverse sinus, straight sinus, sigmoid sinus and cavernous sinus.
The confluence of sinuses (Latin: confluens sinuum), torcular Herophili, or torcula is the connecting point of the superior sagittal sinus, straight sinus, and occipital sinus. It is below the internal occipital protuberance of the skull. It drains venous blood from the brain into the transverse sinuses.
The superior cerebral veins are several cerebral veins that drain the superolateral and superomedial surfaces of the cerebral hemispheres into the superior sagittal sinus. [1] There are 8-12 cerebral veins. [further explanation needed] They are predominantly found in the sulci between the gyri, but can also be found running across the gyri.
Cerebral venous sinus thrombosis is more common in particular situations. 85% of people have at least one of these risk factors: [3] Thrombophilia, a tendency to develop blood clots due to abnormalities in coagulation, e.g. factor V Leiden, deficiency of protein C, protein S or antithrombin, or related problems
The external cerebral veins known as the superficial cerebral veins are the superior cerebral veins, inferior cerebral veins, and middle cerebral veins. The superior cerebral veins on the upper side surfaces of the hemispheres drain into the superior sagittal sinus. [1] The superior cerebral veins include the superior anastomotic vein.
At these sites, the epidural space is wide enough to house the epidural venous sinuses. [2] [4] [5] There are four fibrous septa: [4] Falx cerebri, that separates the left and right hemispheres of the cerebrum. It contains the superior sagittal sinus and inferior sagittal sinus.
The superior sagittal sinus divides into two parts called the transverse sinuses where the falx cerebri meets the tentorium cerebelli. [3] The sigmoid sinus, which continues the transverse sinus, empties into the jugular vein at the jugular foramen. The internal jugular vein leaves the skull and travels downward to the neck. [3]