BRANCHES OF THE INTERNAL CAROTID TO THE BRAIN. 263 



like the other through some of the foramina of the cribriform 

 plate to the anterior ceils of the ethmoid bone, and to the ante- 

 rior part of the Schneiderian membrane on the septum of the 

 nose, to which it sends a considerable branch. 



In its course it sends twigs to the frontal sinuses, and to the 

 dura mater and its falciform process. 



8. The arteries of the Paljpebrce are called Superior and In- 

 ferior ; they leave the ophthalmic near the loop or pulley of the 

 superior oblique muscle. The inferior comes off first ; it sends 

 branches to the ligaments of the tarsus, the caruncula lachry- 

 malis, and the parts connected with the cartilage of the under 

 eyelid, and unites with the lachrymal artery near the external 

 canthus, forming an arch called the Inferior Tarsal Arch. 



9. The Superior Artery supplies the superior part of the 

 orbicularis muscle, the ligament and caruncula also : and it 

 likewise unites with a twig of the lachrymal, and forms the 

 superior tarsal arch. 



Soon after sending off the palpebral branches, the Ophthalmic 

 Artery arrives at the internal canthus, and then finally divides 

 into two branches, the nasal and the frontal. 



10. The Nasal Branch passes above the superior part of the 

 lachrymal sac, and the ligament of the eyelid to the nose ; after 

 sending a twig to the frontal muscle and the lachrymal sac, it 

 passes down the side of the nose and anastomoses with the 

 facial artery. 



11. The Frontal Artery is not so large as the nasal ; it gene- 

 rally divides into three parts. A superciliary branch, which is 

 principally spent upon the eyebrows ; a superficial branch, which 

 is spent upon the forehead; and a branch which is distributed 

 to the pericranium. 



The Internal Carotid, soon after parting with the ophthalmic, 

 sends off, in a posterior direction, a branch to join one from the 

 vertebral artery. From its destination, this vessel is called the 

 arteria communicans. 



After this it sends off another branch, which is so large that 

 it may be considered as a continuation of the main trunk : this 

 is called the middle artery of the brain, or the Arteria Sylvi- 



