142 THE SALAMANDER 



trigeminus and facialis fibres, so that it is not possible to determine 

 the precise distribution of each component by dissection. In general 

 they spread over the roof of the mouth under the nasal organs (see 

 also description of R. palatinus VII). 



V2. R. maxillaris (n.5b.) (mixed, general cutaneous, and visceral 



motor). 



R. supramaxillaris inferior , . . von Plessen and Rabinowicz. 



R. maxillaris superior ....... Hoffmann. 



(Jn the larva this nerve is combined with a lateral line nerve — R. buccalis 

 VII — to form the truncus infra-orbitalis ,^ 



After separating from the Gasserian ganglion the maxillary nerve 

 enters the antrum petrosum laterale (Driiner) from which it emerges 

 between the processus ascendens and the processus oticus of the 

 quadrate, and passes, mesial to the M. levator mandibulae externus, 

 to the posterior angle of the eye. Here it divides into : 



(i) The superior palpebral nerve (n.s.palp.), (R. dorsalis, Hoffmann), 

 ('accessory twigs' of the trigeminus, Coghill), which consists of one or 

 two fairly strong branches supplying the skin of the upper eyelid and 

 also part of that covering the levator mandibulae muscle and ear- 

 capsule. The terminal twigs from these nerves appear to anastomose 

 with those from the superficial branches of the ophthalmicus pro- 

 fundus V. 



(ii) An inferior palpebral nerve (n.i.palp.) (with the remainder of 

 the nerve = R. ventralis, Hoffmann) which supplies the skin of the 

 lower eyelid. 



(iii) A very fine motor branch to the M. levator bulbi which 

 usually arises between the two palpebral nerves. 



(iv) The maxillaris nerve (n.max.) proper, of mixed constitution. 

 This nerve passes round the orbit somewhat lateral to the previous 

 branch, and gives off sundry twigs as follows : 



(a) From its mesial side, one or two motor twigs to the M. levator 

 bulbi. 



{b) About three lateral branches which pass successively to the skin 

 of the upper jaw as far as the anterior angle of the orbit. 



Hoffmann describes an anastomosis between the latter branch and 

 the R. palatinus VII, but no sign of such a fusion has been found — a 

 result which is in harmony with the findings of Kingsley (1896). 

 Hoffmann also suggests that the superior palpebral branch (his R. 

 dorsalis) is the representative of the Selachian ophthalmicus super- 

 ficialis. While it may possibly represent a portion of this nerve, 

 it should nevertheless be noted that it emerges from the antrum 



