1456 A MANUAL OF ANATOMY 



the optic thalamus, the corresponding choroid plexus of the third 

 ventricle, the corpus callosum, and the corpora quadrigemina ; 

 and, prior to joining its fellow, it takes up the basilar vein of its 

 own side. The vena magna Galeni receives tributaries from the 

 upper surface of the cerebellum. 



The anterior cerebral vein of each side is situated in the great 

 longitudinal fissure, along with the corresponding artery. Having 

 curved round the genu of the corpus callosum it passes to the 

 region of the locus perforatus anticus, where it joins the deep Sylvian 

 vein to form the basilar vein. 



The deep Sylvian vein returns the blood from the island of Reil, 

 and lies deeply within the stem of the fissure of Sylvius. At the 

 locus perforatus anticus it joins the anterior cerebral vein to form, 

 as stated, the basilar vein. 



The basilar vein of each side commences at the locus perforatus 

 anticus, where it is formed by the union of the anterior cerebral 

 and deep Sylvian veins. It passes backwards round the cms 

 cerebri, and opens into the vein of Galen of its own side, just before 

 that vessel joins its fellow to form the vena magna Galeni. The 

 basilar vein receives, close to its commencement, one or more 

 inferior striate veins, which descend from the corpus striatum 

 through the locus perforatus anticus. It also receives tributaries 

 from the parts within the interpeduncular space. 



The cerebellar veins are arranged in two groups — superior and 

 inferior. 



The superior cerebellar veins terminate in the vena magna Galeni, 

 and in the straight, lateral, and superior petrosal sinuses. The 

 inferior cerebellar veins pass to the lateral, inferior petrosal, and 

 occipital sinuses. 



Blood-supply of the Different Parts of the Encephalon. 



The medulla oblongata is supplied by the vertebral, anterior spinal, and 

 posterior inferior cerebellar arteries. 



The pons Varolii is supplied by the transverse or pontine branches of the 

 basilar artery. 



The cerebellum is supplied inferiorly by the posterior inferior cerebellar 

 branches of the vertebral arteries, and the anterior inferior cerebellar branches 

 of the basilar artery. Superiorly it is supplied by the superior cerebellar 

 branches of the basilar artery, and, to a limited extent, by the posterior 

 inferior cerebellar arteries. 



The crus cerebri is supplied by the postero-mesial and postero-lateral 

 branches of the posterior cerebral artery, and by the posterior communicating 

 artery. 



The locus perforatus posticus is pierced by the postero-mesial branches of 

 the posterior cerebral arteries. 



The corpora quadrigemina are supplied by the postero-lateral branches of 

 the posterior cerebral arteries. 



The optic thalamus is supplied posteriorly by the postero-mesial and postero- 

 lateral branches of the posterior cerebral artery. Anteriorly its outer part 

 is supplied by the lenticulo-optic branches of the middle cerebral artery, and 

 its inner part by the posterior communicating artery. 



The locus perforatus anticus is pierced by the antero-lateral ganglionic 

 branches of the middle cerebral artery. 



