The document discusses the three meninges - the outer dura mater, middle arachnoid mater, and inner pia mater. It describes the layers of the dura mater, venous sinuses within the dura mater including the superior sagittal sinus, transverse sinus and sigmoid sinus, arteries that supply the dura mater, and the subarachnoid space between the arachnoid mater and pia mater. It also mentions the choroid plexus which is involved in cerebrospinal fluid production.