Workman, Nerves of the Cat Fish. 405 



trigeminus, makes up the " supero-lateral strand" of Wright; 

 the latter come from the communis root of the facialis, the 

 '• infero-medial strand " of Wright. This nerve, it should be 

 stated, however, separates intra-cranially directly from the gan- 

 glionic complex before the two strands described by Wright 

 have been well differentiated and some distance caudad of the 

 point where these strands are re-arranged to form the maxillary 

 and mandibular rami. 



The ophthalmicus superficialis V runs forward some dis- 

 tance within the cranium, then passes out laterally through a 

 foramen and continues cephalad running close to the cranial 

 wall over the n. opticus and under the m. dilator operculi. 

 Its first branch, given off soon after its emergence from the 

 foramen, runs out laterally under this muscle and the m. levator 

 arcus palatini, follows the latter nearly to its cephalic end, 

 then breaks up to supply the skin and terminal buds dorsally 

 of the eye, some fibers also running out onto the cornea. 



Cross sections of the nerve in this region show two ill- 

 defined groups of fibers. Dorsally the fibers are chiefly of 

 small or medium size, with very many rather coarse ones 

 among them. The ventral half of the cross section is made up 

 almost exclusively of exceedingly fine fibers with a few of me- 

 dium size scattered among them. The dorsal is probably the 

 general cutaneous portion and the ventral the communis. 



A second and smaller branch follows soon after the first 

 and pursues a similar course, some of its fibers, however, turn- 

 ing dorsally to run between the most cephalic tip of the m. 

 dilator operculi and its insertion on the frontal bone. This 

 second branch supplies skin and terminal buds dorsally and in 

 front of the eye. 



The main nerve, having meanwhile become separated from 

 the cranium by a slip of the muscle last mentioned near its 

 origin from the cranium, now sends off its third branch, which 

 is much larger than those previously mentioned and which fol- 

 lows a course essentially similar, distributing to the skin of the 

 top of the head farther cephalad than the last. In front of the 

 origin of the levator arcus palatini from the cranium it rises up 



