"sphenoparietal type: (54%) drains into the sphenoparietal sinus"
"emissary type: (12%) courses along the lesser wing of sphenoid, turns inferiorly to reach the floor of the middle cranial fossa, joins the sphenoidal emissary veins, and passes through the floor to reach the pterygoid plexus"
"superior petrosal type: (2%) runs along the lesser wing and just before reaching the cavernous sinus, turns downward along the anterior inner wall of the middle cranial fossa, then runs along its floor medially to the foramen ovale to join the superior petrosal sinus"
"The superficial middle cerebral vein usually courses along the Sylvian fissure posteroanteriorly and drains numerous small tributaries from the opercular areas around the lateral sulcus. It curves anteriorly around the tip of the temporal lobe and drains into the sphenoparietal sinus or directly into the cavernous sinus. There is, however, significant variation (see Variant anatomy)."
"undeveloped type: (9%) absent; superficial Sylvian drainage is through a large channel that extends forward, upward, upward and backward, or downward and backward into the superior sagittal sinus or transverse sinus"
"undeveloped type: (9%) absent; superficial Sylvian drainage is through a large channel that extends forward, upward, upward and backward, or downward and backward into the superior sagittal sinus or transverse sinus"