074 '^'■- TIAKKIS II WILDKR, 



miens profundus, soon enters a cartilaginous canal and finally emerges 

 by an opening of its own somewhat anterior to the others. 



I. Ramus ()i>h thalmicus superficialis. 

 This rather small branch, wholly sensory in its function, forms, 

 together with Kamus maxillae superioris, the first main trunk; sepa- 

 rating from the latter almost immediately but still accompanying it as 

 it runs forward. Between the temi)oralis and masseter muscles these 

 two nerves run nearly together and first diverge as they emerge at the 

 anterior border of the muscles, the R. ophthalmicus superficialis being 

 the most superior. This nerve still continues forwards and a little 

 upwards, resting upon the roof of the nasal capsule: it supplies the 

 skin in the supra-nasal and ethmoidal regions. 



II. Ramus ophthalmicus profundus. 

 'J'his branch, also sensory, is the lowest of the three })rimary di- 

 visions and runs through a cartilaginous canal before issuing from 

 the skull. The nerve there lies in a groove, and close to the walls 

 of the skull. Farther forward it rests upon the Ligamentum intermus- 

 culare anterius, where it may be easily prepared ; runs behind the 

 eye, and after resolving itself into two or three divisions, passes into 

 the nasal cai)sule from behind. Its branches are as follows: 



1 . Ramus o p h t h a 1 m i c us p r o f u n d u s m i n o r. 

 This nerve branches from the main stem while resting upon the 

 intermuscular ligament, and accompanies it as far forward as the eye. 

 It sends ofi' a few small lateral branches to the skin. 



2. Superior branches (N e r v i s u p r a - 1 e m p o r a 1 e s). 



These are several small branches which curve upward around 

 the anterior border of the temporalis, and supply the skin which lies 

 above that muscle. 



;]. Nervus nasalis ex te mus. 

 This rather large and important Ijranch curves ai'ound the anterior 

 side of the eye, enters the nasal capsule from behind and courses 

 along the inner wall of its outer wing. 



4. Nervus com m uni can s ophthalmicus. 

 This branch runs inwards and downwards, meeting the N. c o m- 

 m uni can s m axillaris, with which it unites to form the N. n a s a- 

 lis internus. 



