52U 



THE VEINS OF THE HEAD AND NECK. 



right and left veins of Galen run backwards, lying close together between the layers 

 of the velum interposituni ; and beneath the splenium of the corpus callosum they 

 join into a short common trunk (vena magna Gfaleni), which ascends to reach the 

 anterior extremity of the straight sinus, where it opens. They receive on their way 

 branches from the inner side of the optic thalamus, from the choroid plexuses of the 

 third ventricle, and from the corpus callosum, the large basilar vein, and small vessels 

 from the corpora quadrigemina and pineal body, as well as a branch from the posterior 

 cornu of the lateral ventricle. The common trunk is also joined by veins from the 

 inner and lower surfaces of the occipital lobe, and from the hinder part of the callosal 

 convolution of each hemisphere, and by some small veins from the upper surface 

 of the cerebellum. 



The basilar vein is formed opposite the anterior perforated space at the base of 

 the cerebrum by the union of 1, a small anterior cerebral vein, which accompanies 

 the artery of the same name below the genu of the corpus callosum, and communi- 



Fig. 403. UPPER SURFACE OF 



THE VELUM INTER POSITUM, 

 WITH THE CHOROID PLEXUSES 

 OF THE LATERAL VENTRICLES 

 AND THE VEINS OF GALEN. 



(From Sappey after Vicq- 

 d'Azyr.) jj 



1, fore part of velum iuter- 

 positurn ; 2, choroid plexus ; 3, 3, 

 left vein of Gralen ; 4, veins from 

 the corpus callosum and septum 

 lucid urn ; 5, vein of corpus stria- 

 turn; 6, choroid vein; 7, vein from 

 optic thalamus ; 8, vein from the 

 inferior cornu, and 9, vein from the 

 posterior cornu of the lateral ven- 

 tricle ; 11, 12. 13, fornix, divided 

 anteriorly and turned backwards ; 

 14, splenium of corpus callosum. 



cates with the vein of the 

 opposite side ; 2, the deep 

 Sylvian vein, which lies in 

 the lower part of the fissure 

 of Sylvius, communicating 

 freely with the middle cere- 

 bral vein, and collecting- 

 branches from the insula 

 and adjacent parts of the 

 frontal and temporal lobes ; 

 and 3, the inferior striate 

 veins, which descend from 



the corpus striatum through the anterior perforated space. It passes backwards 

 round the cms cerebri, .receiving in its course branches from the parts in the inter- 

 peduncular space, from the midbrain, from the uncinate convolution, and from 

 the inferior cornu of the lateral ventricle ; and it ends by opening into the vein of 

 Galen just before that vessel unites with its fellow. 



The veins of the cerebellum are disposed in two sets. The superior cereMlar 

 veins are directed partly upwards and inwards to the straight sinus and the vena 

 magna Galeni, partly outwards to the superior petrosal and lateral sinuses. The 

 inferior cereMlar veins, together with the veins from the medulla -"~ 

 pons, enter the inferior petrosal, lateral and occipital sinuses. 



oblongata 



and 



