BRANCHES OF THE INTERNAL CAROTID. 



507 



former, which is the smaller, passes through the posterior ethmoidal foramen, 

 supplies the posterior ethmoidal cells, and, entering the cranium, gives off a 

 meningeal branch, which supplies the adjacent dura mater, and nasal branches 

 which descend into the nose through apertures in the cribriform plate, anasto- 

 mosing with branches of the spheno-palatine. The anterior ethmoidal artery 

 accompanies the nasal nerve through the anterior ethmoidal foramen, supplies the 



FIG. 291. The arteries of the base of the brain. The right half of the cerebellum and pons have been 

 removed. 



N.B. It will be noticed that in the illustration the two anterior cerebral arteries have been 

 drawn at a considerable distance from each other : this makes the anterior communicating artery 

 appear very much longer than it really is. 



