386 



THE BRAIN 



backwards to join the posterior cerebral, between its postero- 

 median and postero-lateral groups of central twigs (Fig. 144). 



Arteria Chorioidea. The chorioidal artery enters the 

 inferior cornu of the lateral ventricle, and passes into the 

 chorioid plexus in that cavity (Fig. 147). 



Arteriae Cerebri Anteriores. Each anterior cerebral artery 

 runs first horizontally, above the optic chiasma, towards the 

 median plane (Figs. 146, 147). Then, bending sharply upon 



Medial .orbital branches 



Olfactory sulcus 



Lateral orbital branches 



1; j \V/ 1 / W ^~~^\W/\ 



Anterior cerebral artery 



Anterior communicating 



artery \ 



Internal carotid artery 

 Middle cerebral artery 



Posterior communicating .-' 

 artery 



Superior cerebellar artery 



Basilar artery 



Posterior chorioidal artery 



Posterior cerebral artery 

 Calcarine fissure - 



Chorioidal branch of 

 internal carotid 



. Temporal 

 branches 



Inferior temporal 

 sulcus 



Collateral fissure 



FIG. 147. 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. 



itself, it turns upwards, in the anterior part of the longitudinal 

 fissure, anterior to the lamina terminalis, and along the rostrum 

 to the genu of the corpus callosum, round which it bends ; 

 then it passes backwards, along the medial face of the corre- 

 sponding hemisphere, on the upper surface of the corpus 

 callosum, to the parieto-occipital fissure (Fig. 146). As it 

 lies anterior to the lamina terminalis it is connected with the 

 opposite anterior cerebral artery by the anterior communicating 



