Fig. 1.

The structure and location of dorsal and basal mLVs. Schematic images of dorsal and basal mLVs tracking along the dural sinus with differences in structures, branches, lumen diameter, and lymphatic valves. Dorsal mLVs travel along the superior sagittal sinus (SSS) and transverse sinus (TS). The lumen is primarily a discontinuous vascular structure, with a small diameter and no valves. Basal mLVs are located near the subarachnoid space (SAS) and run along the petrosal sinus (PSS) and sigmoid sinus (SS). The lumen is primarily a continuous vascular structure with a large diameter and lymphatic valves.