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A MANUAL OF ANA TOMY. 



(shortest in the body) termed the anterior communicat- 

 ing. 



For the branches of the anterior cerebral, see under the 

 ganglionic and cortical systems. 



The middle cerebral arteries follow, outward, upward, 

 and then backward in the fissure of Sylvius, and near its 

 middle part divide into four terminal branches ; for their 

 course and distribution see Cortical System. 



Diag. 10. A DIAGRAM OF THE GANGLIONIC ARTERIAL SUPPLY OF THE BRAIN. 

 (Charcot, from Gray.) i, Anterior communicating. 2, Anterior cerebral. 3, Inter- 

 nal carotid. 4, Middle cerebral. 5, Posterior communicating. 6, Posterior cerebral. 7, 

 Basilar. 8, Vertebral, a, Anteromedian group, b, Anterolateral group, c, Postero- 

 median group, d, Posterolateral group. 



The posterior cerebral arteries pass outward and then 

 backward around the crura cerebri and supply the inner 

 and under surface of the occipital and temporal lobes. 



The middle and posterior cerebrals are joined together 

 in front of the crura cerebri by the posterior communicat- 

 ing arteries. These are usually small vessels ; one may be 



