Venous Drainage of the Central Lobe. A, A common pattern of drainage. The superior two-thirds of the right hemisphere is drained by the cortical veins emptying into the superior sagittal sinus. The inferior third drains through the frontosylvian and parietosylvian veins to a superficial sylvian vein that empties into a large vein of Labbé and the transverse sinus. B, Three veins of Trolard (green arrows) crossed this left hemisphere, connecting the superficial sylvian vein with the superior sagittal sinus. The posterior part of the central lobe is drained through the posterior vein of Trolard. A precentral vein drains a large portion of the central lobe. The inferior third is drained by the frontosylvian and parietosylvian veins, except for the anterior part of the precentral gyrus, which drains through the middle anastomotic vein of Trolard. C, A large common trunk receives drainage from several cortical veins before passing below a large venous lacuna to empty into the superior sagittal sinus. The majority of the posterior right central lobe is drained by central and precentral veins that pass below this lacuna. The posterior part of the central lobe drains to the superior sagittal sinus through a large anastomotic vein of Trolard. D, A large precentral vein drained the majority of the superior two-thirds of the precentral gyrus. The central vein drained a portion of the precentral gyrus and emptied into the larger precentral vein that emptied into the superior sagittal sinus. The inferior third of the central lobe drained into a hypoplasic superficial sylvian vein joined to a vein of Labbé that emptied into the transverse sinus. The superior two-thirds of the postcentral gyrus is drained by a postcentral vein that empties into the superior sagittal sinus. E, The right central lobe is drained predominantly by a large central vein that empties into the superior sagittal sinus. A small portion of the anterior edge of the precentral gyrus is drained by the posterior and middle frontal veins that form a common trunk before emptying into the superior sagittal sinus. The lower portion of the central lobe is drained by frontosylvian and parietosylvian veins that empty into the superficial sylvian vein. F, Enlarged view of the opercular region of another right hemisphere. The lower portion of the central lobe is drained by frontosylvian and parietosylvian veins that empty into a superficial sylvian vein that emptied predominantly through a large vein of Labbé into the transverse sinus. (Images courtesy of AL Rhoton, Jr.)