MEMBRANES AND BLOOD VESSELS 



449 



Numerous branches proceed from the anterior cerebral artery : 

 Basafl or central { Antero-median. 



f Medial orbital. 

 r . , J Anterior medial frontal. 



I Intermediate medial frontal. 

 I Posterior medial frontal. 



The antero-median arteries pierce the base of the brain anterior to the 

 optic chiasma. They supply the rostrum of the corpus callosum, the 

 lamina terminalis, and the septum pellucidum. 



The medial orbital branches are two or three in number. They turn 

 round the margin of the longitudinal fissure to reach the medial part of the 



Ascending parietal artery 

 Ascending frontal artery 

 Precentral sulcus 

 Inferior frontal 

 sulc 



Central sulcus 



Parieto-temporal artery 



Inferior lateral frontal 

 artery 

 Posterior branch of lateral fissure 



Temporal branches 



FIG. 1 80. Lateral Surface of the Cerebral Hemisphere. The districts supplied 

 by the three cerebral arteries are tinted differently : anterior cerebral, 

 purple; middle cerebral, blue ; posterior cerebral, red. (Semi-diagram- 

 matic. ) 



orbital surface of the frontal lobe. They supply the gyrus rectus, the olfactory 

 tract and bulb, and the medial orbital gyrus (Figs. 178 and 179). 



The anterior medial frontal artery ramifies upon the anterior part of the 

 medial surface of the frontal lobe, and its terminal twigs turn round the 

 upper margin of the cerebral hemisphere, and supply the upper part of the 

 lateral surface of the frontal lobe (Fig. 178). 



The intermediate medial frontal artery ramifies on the medial surface 

 of the frontal lobe posterior to the preceding branch. Its terminal part 

 passes over the paracentral lobule, and reaches the adjacent portion of the 

 lateral surface of the cerebral hemisphere (Fig. 178). 



The posterior medial frontal artery ramifies on the medial surface of 

 the prsecuneus, and its terminal twigs turn round the upper margin of 

 the cerebral hemisphere to gain the lateral surface. 



Arteria Cerebri Media. At first the middle cerebral artery 

 passes laterally and then upwards in the lateral fissure. It 

 VOL. II 29 



