CRANIAL NERVES. 311 



opening of the orbit, into several branches. One, the 

 supra-orbital, passes through the supra-orbital foramen, 

 and is distributed to the skin of the frontal region. The 

 other passes downward, and is distributed to the skin of 

 the side of the nose. The nasal passes forward to the 

 anterior ethmoidal foramen, enters the cranium, and 

 passes through a slit-like opening at the side of the crista 

 galli into the nose, and supplies its mucous membrane 

 with sensation. 



Lenticular Ganglion. Associated with the ophthal- 

 mic nerve is a small sympathetic ganglion, lens-shaped, 

 and placed at the posterior part of the orbit, between the 

 optic nerve and external rectus. It is imbedded in fat, 

 and is about the size of a hemp-seed. It has three 

 roots, a sensory from the nasal branch of the ophthal- 

 mic, a motor from the third nerve, and a sympathetic 

 from the cavernous plexus. The branches of the lentic- 

 ular ganglion are the short ciliary, which pass forward 

 and are distributed to the eye. 



The superior maxillary nerve supplies sensation to 

 the structures associated with the upper jaw. It passes 

 forward through the foramen rotundum, across the upper 

 part of the spheno-maxillary fossa, enters the infra-orbital 

 canal and emerges at the infra-orbital foramen. The 

 branches of the superior maxillary consist of three sets, 

 the spheno-palatine, infra-orbital, and facial. The spheno- 

 palatine branches are: 1. The orbital, which divides into 

 the temporal and malar, the former distributed to the 

 temporal region, the latter to the malar region. Both 

 nerves emerge through foramina in the malar bone. 2- 

 The spheno-palatine are two sensory roots. to Meckel's 

 ganglion. 3. Posterior dental, one or two in number, 

 enter canals which open on the posterior border of the 

 superior maxillary and supply the molar teeth, communi- 



