LACUNAE LATERALES

Lateral expansions of the superior sagittal sinus of the dura mater, often increasing in width with advancing age before, in the very old, they may extend two centimeters lateral to the midline; the endothelium-lined lumen of the lacunae are generally reduced to a spongelike labyrinth by numerous arachnoid granulations and dural trabeculae. Synonym: lacunae laterales, lateral lacunae, lateral lakes, parasinoidal sinuses.