152 EDWARD PHELPS ALLIS, JUN. 



As^ or shortly after, the ophthalmicus passes upward out 

 of the orbit a lateral sensory branch is sent to organs 74 and 

 75, and two others to organs 65 to 73, organ 65 being the 

 middle one of three organs that lie in that short section of the 

 supra-orbital canal that lies between the two bends in the 

 canal, slightly in front of the eye. At the same time that 

 these three lateral branches are given off the larger part of 

 the general sensory component of the nerve passes gradually 

 upward, as two nerve strands, along the mesial surface of 

 the remainder of the nerve. These two nerve strands leave 

 the main nerve separately, and then, farther forward, unite 

 to form a single nerve, which here lies immediately dorsal to 

 the remaining and much larger part of the nerve. This 

 latter, deeper part of the nerve now consists almost entirely 

 of special sensory fibres, but there is still a small bundle of 

 general sensory fibres in its ventral portion. 



Having issued from the orbit the two strands now formed 

 of the originally single nerve lie at first along the sloping 

 surface of the lateral wall of the brain case, immediately 

 dorsal to the anterior end of the roof of the orbit, and then 

 pass dorsal to the antorbital process. Anterior to that 

 process a large general sensory branch is given off from the 

 ventral aspect of the main nerve. Running forward slightly 

 below the main nerve it soon turns outward toward that part 

 of the supra- orbital canal that lies anterior to the double 

 bend in front of the eye, and accompanies it in its forward 

 course. Slightly anterior to the point where this general 

 sensory branch is given off a large lateral canal branch is 

 sent downward and backward, at first along the lateral 

 surface of the brain case, and then along the lateral surface 

 of the nasal capsule. From it numerous branches, some of 

 them quite long, run forward and downward along the side 

 wall of the brain case and nasal capsule, and innervate organs 

 1 to 16 supra-orbital, the section of canal thus innervated 

 lying on the ventral surface of the head, in the region lateral 

 to the nasal aperture. This large lateral branch leaves the 

 main nerve directly dorsal to the foramen by which the 



