Superior sagittal sinus

A major venous channel located within the brain's dural layers.

The superior sagittal sinus is a large, triangular-shaped venous sinus situated along the midline of the brain. It is formed by the confluence of cerebral veins, draining blood from the brain and ultimately directing it towards the internal jugular veins. This sinus plays a crucial role in the venous drainage system of the brain, collecting blood from various regions before it exits the cranial cavity.

Terminologia Anatomica

sinus sagittalis superior

System

Circulatory system

Function

The primary function of the superior sagittal sinus is to facilitate the drainage of deoxygenated blood from the brain back to the heart. It collects blood from the cerebral hemispheres, which is then directed towards the transverse sinuses. This sinus also helps to maintain intracranial pressure and assists in the circulation of cerebrospinal fluid by allowing the reabsorption of this fluid into the venous system. Its position enables it to efficiently gather blood from both the cortical and subcortical regions of the brain, ensuring that the brain remains perfused and free of excess metabolic waste.

Location

The superior sagittal sinus runs along the midline of the skull, extending from the frontal bone to the occipital bone. It is located in the space between the dura mater, which is the outermost protective layer of the brain, and the skull. This sinus begins at the crista galli, a small projection of bone at the front of the skull, and terminates at the confluence of the sinuses, where it joins the transverse sinuses. The positioning of the superior sagittal sinus allows it to effectively gather venous blood from both the left and right hemispheres, seamlessly integrating into the larger venous drainage system of the brain.

Did You Know?

The superior sagittal sinus is lined with a delicate layer of endothelium, which regulates the flow of blood and plays a role in preventing clot formation.
This sinus can vary in size and shape among individuals, sometimes influencing the flow dynamics of cerebral venous drainage.
The superior sagittal sinus can become occluded due to thrombosis, which can lead to increased intracranial pressure and various neurological symptoms.
Despite being a passive conduit for blood, the superior sagittal sinus is critical in maintaining the overall health and function of the brain.