The meninges have three layers called the dura mater, arachnoid mater, and pia mater. They are also separated by gaps or spaces in some areas. Both cranial and spinal meninges are broken down into ...

which are expressed by the endothelial cell walls of both the lymphoid tissue and the meningeal spaces, where germinal centers are formed. The upregulation of BAFF and APRIL and the secretion of ...