Vincent Leealmost 4 years ago

Brain with its covering layer!

Here is a great shot showing the brain with its covering layer! 🧠 Can you name the white sheet displayed here? Below the skull and around the spinel cord are three special coverings called the meninges. You may have heard of the illness called meningitis. Meningitis is an infection of the meninges. The outer layer of the meninges is called the dura mater or just the dura. The dura is tough and thick andit can restrict the movement of the brain within the skull. This protects the brain from movements that may stretch and break brain blood vessels. The middle layer of the meninges is called the arachnoid. Underneath the arachnoid is a space known as the sub-arachnoid space. It contains cerebrospinal fluid, which acts to cushion the brain. Small projections of arachnoid mater into the dura (known as arachnoid granulations) allow CSF to re-enter the circulation via the dural venous sinuses. The inner layer, the pia mater, is located underneath the sub-arachnoid space. It is very thin, and tightly adhered to the surface of the brain and spinal cord. It is the only covering to follow the contours of the brain (the gyri and fissures). Like the dura mater, it is highly vascularised, with blood vessels perforating through the membrane to supply the underlying neural tissue.