VEINS OF THE CEREBRUM. 23 



The veins of this group which do not empty into the superior 

 cerebral veins unite and form the inferior sagittal sinus, and the 

 anterior cerebral vein which drains much of the medial surface. 



The inferior cerebral veins (vena cerebri inferiores) drain the 

 base of the cerebrum and the lower border of its convex sur- 

 face. On the tentorial surface of the hemisphere, from three to 

 five of these veins empty into the transverse and superior petrosal 

 sinuses. Those from the temporal and frontal lobes empty into 

 the spheno-parietal sinus and cavernous sinus, excepting the 

 small anterior cerebral vein and the deep middle cerebral vein, 

 which unite with the inferior striate veins in forming the basilar 

 vein. The anterior cerebral vein accompanies the artery of the 

 same name. It drains the gyrus cinguli and corpus callosum, 

 chiefly; and, in the fossa lateralis cerebri, unites with vessels that 

 descend from the corpus striatum, the inferior striate veins, and 

 with the deep middle cerebral vein. The deep vena cerebri media 

 drains the insula and the opercula, in part, and deep in the fissure 

 runs medianward to the fossa lateralis cerebri and helps to form 

 the basilar. The basilar vein (v. basilaris), is formed at the 

 anterior perforated spot by the deep middle cerebral, the inferior 

 striate and the anterior cerebral veins. Running backward it 

 receives additional blood from the interpeduncular structures, 

 the hippocampal gyrus and the inferior horn of the lateral ventricle, 

 and from the mid-brain, as it winds around it to empty into the 

 corresponding internal cerebral vein near its termination. In the 

 fissura lateralis cerebri (Sylvii) runs also a superficial vein, called 

 the superficial middle cerebral (v. cerebri media) which receives 

 tributaries from the surfaces adjacent to the posterior ramus and 

 the stem of that fissure and empties into the cavernous sinus; but 

 it may have two other outlets, viz., the transverse sinus and the 

 superior sagittal sinus. The connection occasionally established 

 between the superficial middle cerebral vein and the transverse 

 sinus is called the posterior anastomotic vein; while the great anas- 

 tomotic vein (of Trolard) is produced when it joins one of the 

 superior cerebral veins. The great anastomotic vein connects 

 the superior sagittal with the cavernous sinus. 



There are no lymphatic vessels in either the brain or spinal 



