I40 THE SALAMANDER 



to the M. rectus superior, and immediately above the muscle it gives 



off:— 



(a) The superior ciliary nerve (n.cil.s.) — a fairly large branch which 

 either passes over, or through, the muscle and penetrates the sclerotic 

 coat of the eyeball. This would appear to be the V^""' of Hoff- 

 mann. 



(J?) The rest of the nerve — Hoffmann's V^^' — which is distributed 

 to the skin overlying the postero-mesial portion of the orbit. 



It would seem to be this nerve that the earlier authors described 

 as supplying the M. rectus superior. 



(ii) Just ventral to the superior rectus muscle a fairly large branch 

 arises which almost immediately divides into two — Hoffmann's 

 V^^\ Both branches pass dorsal to the M. obliquus superior and are 

 distributed to the skin covering the fronto-ethmoidal region, and 

 thus would appear to be the equivalent of the RR. frontales et palpe- 

 brales superiores anteriores (Gaupp) of the Frog. 



These branches very frequently receive an anastomosis from the 

 previous branch, which passes ventral to the M. rectus superior. 



(iii) From the ventral side of the main profundus nerve, just pos- 

 terior to the optic nerve, the inferior ciliary nerve (n.cil.i.) is given off. 

 It passes between the optic nerve and the M. retractor bulbi and 

 receives (or gives T) a fine anastomosis from the oculomotor nerve. 

 With this anastomosis are associated both the nerve which runs 

 parallel with the optic nerve to enter the eyeball (see also under N. 

 oculomotorius) and the ciliary ganglion. 



The inferior ciliary nerve then proceeds lateralwards together with 

 the oculomotor, keeping dorsal to the M. rectus inferior. The nerves 

 cross one another above this muscle, and the inferior ciliary nerve 

 continues in a lateral direction, penetrates the muscle to the ventral 

 side, and then enters the sclerotic coat of the eyeball near the inser- 

 tion of the muscle. 



Just after penetrating the muscle it gives off a branch which passes 

 anteriorly over the floor of the orbit, and is distributed to a small 

 section of the skin of the upper jaw between the most anterior branch 

 of the maxillary nerve and the most posterior twig of the lateral ter- 

 minal branch of the profundus. 



Terminal branches of the profundus (V^*" + V^"^, Hoffmann). 



A little anterior to the point where it crosses the optic nerve the 

 ophthalmicus profundus divides into three main terminal branches — 

 mesial, lateral, and ventral. These may anastomose variously with 

 one another until the anterior limit of the orbit is reached. They all 



