164 A MANUAL OF ANATOMY. 



utmost importance, especially the lenticulostriate artery. 

 For these see above. 



The cortical arteries are distributed as follows : 



(a) The first supplies the inferior frontal convolution. 

 This is called Broca's artery, supplying that convolution. 

 Its obstruction in the left side produces degeneration 

 of the inferior frontal convolution, which is manifested by 

 disorders of speech. (U) The second supplies the lower 

 two-thirds of the ascending frontal convolution. (<r) The 

 third is distributed to the ascending parietal convolution. 

 (d} The fourth, to the supramarginal, angular, and first 

 temporal convolutions. 



(3) The posterior cerebral. After giving off the posterior 

 lateral ganglionic arteries the posterior cerebral divides into 

 three sets of branches, which are distributed to the under 

 and lower part of the temporal lobe and the lower, inner, 

 and outer surfaces of the occipital lobe. 



The Branches of the Basilar Artery. The formation, 

 course, and ending of the basilar are given on page 158. 



(a) The transverse branches supply the pons. (b) One 

 of these transverse branches follows the auditory nerve into 

 the internal auditory meatus and is termed the auditory 

 artery, (c) Another, a large branch, supplies the anterior 

 part of the under surface of the cerebellum, and is called 

 the inferior cerebellar artery. (</) The superior cerebellar 

 arises near the end of the basilar, courses backward and up- 

 ward around the crus cerebri to the upper surface of the 

 cerebellum, which it supplies, also small branches are given 

 to the pineal gland, velum interpositum, and the valve of 

 Vieussens. 



