part of ends during starts during vein death head vasculature cerebral vein UBERON:0001663 XAO:0004160 xenopus_anatomy The cerebral veins are divisible into external and internal groups according to the outer surfaces or the inner parts of the hemispheres they drain into. The veins are the anterior cerebral veins, posterior cerebral veins, and middle cerebral vein which cross dorsally between the bilateral vena capitis lateralis. 2011-08-30T12:16:59Z lab NF stage 37 and 38