Scientists have discovered a previously unknown protective layer of the brain.

Neurophysiologists from the UK and Denmark have found a hitherto unknown brain membrane. It is involved in the filtration of cerebrospinal fluid and serves as a "depot" for the accumulation of immune cells. The new shell was named SLYM - short for Subarachnoidal Lymphatic-like Membrane, "subarachnoid lymphatic-like membrane." The main studies were carried out on mice, but the presence of the membrane was confirmed in humans.