44 8 



THE BRAIN 



inferior cornu of the lateral ventricle, and passes into the 

 chorioid plexus in that cavity (Fig. 179). 



Arteria Cerebri Anterior. The anterior cerebral runs first 

 horizontally, above the optic chiasma, towards the median plane 

 (Figs. 178, 179). Then, bending sharply upon itself, it turns 

 upwards in the anterior part of the longitudinal fissure, anterior 



Medial orbital branches 



Anterior cerebral artery 



Anterior communicating 

 Internal carotid artery 

 Middle cerebral artery 



Posterior communicating 



Superior cerebellar artery 



Basilar artery 1 ^ 



Posterior chorioidal artery 



Posterior cerebral artery 

 Calcarine fissure 



Olfactory sulcus 



Lateral orbital branches 



Chorioidal branch of 

 internal carotid 



Temporal 

 branches 



Inferior temporal 

 sulcus 



Collateral fissure 



FIG. 179. Inferior Surface of the Cerebral Hemisphere. The districts sup- 

 plied by the three cerebral arteries are tinted differently : posterior cerebral 

 artery, red\ middle cerebral artery, blue ; anterior cerebral artery, purple. 



to the lamina terminalis, and along the rostrum to the genu 

 of the corpus callosum, round which it bends ; then it passes 

 posteriorly along the medial face of the hemisphere, on the 

 upper surface of the corpus callosum, to the parieto-occipital 

 fissure (Fig. 178). As it lies anterior to the lamina terminalis 

 it is connected with the opposite anterior cerebral artery by 

 the anterior communicating artery, and as it passes along the 

 longitudinal fissure, between the hemispheres, it lies close to 

 its fellow of the opposite side. 



