CERVICAL ARTERIES. 269 



Branches of the Vertebral and Basilar Arteries. 



10. The Posterior Artery of the Cerebellum which comes from the Vertebral. 



11. A very considerable branch of the Basilar Artery to jthe Pons 

 Varolii and Cerebellum, which, however, has no name. 



12. The Anterior Artery of the Cerebellum. 



13. The Posterior Artery of the Cerebrum. 



The lesser branches of vessels seen in this Plate are mentioned in the 

 text, but are not distinguished by any particular name. 



The Superior Intercostal Artery 



Arises from the upper part of the Subclavian, after the 

 Vertebral and Thyroid arteries, and very near them. It 

 descends by the side of the spine across the first and second 

 ribs, near their heads, and exterior to the great intercostal 

 nerve. It generally forms two branches, which are appropri- 

 ated to the muscles, &c., in the first and second intercostal 

 spaces, and sometimes a small branch is continued to the third 

 intercostal space. From each of these branches a small vessel 

 proceeds backwards, and is spent upon the contiguous muscles, 

 on the back of the thorax. The Intercostal Artery also 

 sends a branch upwards to the deep-seated parts of the 

 neck. 



In addition to the arteries above mentioned, there are several 

 others of considerable size which originate either directly or 

 indirectly from the Subclavian, and are spent upon the lower 

 portion of the neck and the contiguous parts. These arteries 

 are very different in different subjects, especially as to their 

 origin. Two of them, which have been called the Anterior 

 and Posterior Cervicals, are generally distributed to the muscles 

 and other parts which lie on the lower portion of the neck ante- 

 riorly and posteriorly. 



A third, which passes transversely on the lower part of the 

 neck, is called the Superior Scapular. 



In some cases, the two Cervical Arteries arise from the 



subclavian, after the mammary and the thyroid, in a common 



trunk which soon divides. Very frequently they go off from 



the Inferior Thyroid. Sometimes one of them goes off from 



23* 



