What is a perivascular space in the brain?

A perivascular space, also known as a Virchow–Robin space, is a fluid-filled space surrounding certain blood vessels in several organs, potentially having an immunological function, but more broadly a dispersive role for neural and blood-derived messengers.

What are the spaces in the brain?

Cerebrospinal fluid is a clear liquid produced within spaces in the brain called ventricles. Like saliva it is a filtrate of blood. It is also found inside the subarachnoid space of the meninges which surrounds both the brain and the spinal chord.

What are the 3 layers of the brain?

In between the skull and brain are three layers of tissue,called meninges. They protect the brain. The strong, outermost layer is namedthe dura mater. The middle layer, the arachnoid mater, is a thin membrane madeof blood vessels and elastic tissue.