How does blood drain from the brain?

Blood drains from the brain through a network of blood vessels called the dural venous sinuses. The sinuses are located between the dura mater (the outer layer of the meninges) and the skull. The blood in the sinuses is drained by the internal jugular veins.

The dural venous sinuses are formed by the confluence of small blood vessels that collect blood from the brain. These vessels are called cerebral veins. The cerebral veins merge to form larger vessels, which in turn drain into the sinuses.

The dural venous sinuses are important because they allow the blood to drain from the brain. If the sinuses are blocked, the blood can back up and cause a condition called hydrocephalus. Hydrocephalus can lead to brain damage and death.

The internal jugular veins are the main vessels that drain blood from the dural venous sinuses. The internal jugular veins run from the base of the skull to the heart. The blood from the internal jugular veins is then returned to the heart through the superior vena cava.

The drainage of blood from the brain is a critical process that is necessary for the brain to function properly. If the drainage is impaired, it can lead to serious health problems.