THE VEINS OF THE BRAIN 



653 



The basal vein is formed at the anterior perforated substance by the union of (a) 

 a small anterior cerebral vein which accompanies the anterior cerebral artery, (b) 

 the deep middle cerebral vein (deep Sylvian vein), which receives tributaries from 

 the insula and neighboring gyri, and runs in the lower part of the lateral cerebral 

 fissure, and (c) the inferior striate veins, which leave the corpus striatum through 

 the anterior perforated substance. The basal vein passes backward around the 

 cerebral peduncle, and ends in the internal cerebral vein (vein of Galen) ; it receives 

 tributaries from the interpeduncular fossa, the inferior horn of the lateral ventricle, 

 the hippocampal gyrus, and the mid-brain. 



The Internal Cerebral Veins (vv. cerebri internee; veins of Galen; deep cerebral 

 veins) drain the deep parts of the hemisphere and are two in number; each is formed 

 near the interventricular foramen by the union of the terminal and choroid veins. 

 They run backward parallel with one another, between the layers of the tela 

 chorioidea of the third ventricle, and beneath the splenium of the corpus callosum, 

 where they unite to form a short trunk, the great cerebral vein; just before their 

 union each receives the corresponding basal vein. 



The terminal vein (v. terminalis; vena corporis striati) commences in the groove 

 betw r een the corpus striatum and thalamus, receives numerous veins from both 

 of these parts, and unites behind the crus fornicis with the choroid vein, to form 

 one of the internal cerebral veins. The choroid vein runs along the whole length of 

 the choroid plexus, and receives veins from the hippocampus, the fornix, and the 

 corpus callosum. 



CAUDATE 

 NUCLEUS 



GREAT 

 CEREBRAL VEIN 





PIG. 565. Velum interposition, (Poirier and Charpy.) 



The Great Cerebral Vein (v. cerebri -magna [Galeni]; great vein of Galen) (Fig. 565), 

 formed by the union of the two internal cerebral veins, is a short median trunk 

 which curves backward and upward around the splenium of the corpus callosum 

 and ends in the anterior extremity of the straight sinus. 



The cerebellar veins are placed on the surface of the cerebellum, and are dis- 

 posed in two sets, superior and inferior. The superior cerebellar veins (vv. cerebelli 

 superiores) pass partly forward and medialward, across the superior vermis, to end 

 in the straight sinus and the internal cerebral veins, partly lateralward to the trans- 

 verse and superior petrosal sinuses. The inferior cerebellar veins (vv. cerebelli infe- 

 riores) of large size, end in the transverse, superior petrosal, and occipital sinuses. 



