iridis 



Pupil 



Radial 

 (dilator) 

 muscle 

 of iris 



To ciliary muscle 

 ciliary muscle 



Dilatation 

 of pupil 



Contraction 

 of pupil 



Hill 



Ciliary muscle (accommodation) 

 N.Ill (Contraction of pupil) 



''/j-Efecfroc/es 



(Dilatation or constriction of pupil; 

 contraction of ciliary muscle) 



Electrodes 

 (Dilatation of pupil, 

 opening wider of eyelids, or 

 bulging forward of eyeball) 



Out-going sympathetic rami communicants/ 



Sensory ganglion cell 

 (Sensory nervesfrom eye region) 



mm ' * Nucleus of- 



origin M nerve 



Corpora 



' o.uadrigemina 



Position^) of 

 pupillo-dilator 

 center 



N.VII 



N.VIII 



N.V1 



Medulla 

 oblongata 



Descending symp- 

 athetic fibres 



in the 



-Spinal cord 

 (sp.-medulla) 



Cat, dog, rabbit 



I Thoracic 



n 



W 



Long ciliary '/' 



nerves ,,, 



'Paths 



ofN.I 



Short ciliary 

 nerves 



Jemilunar 



(Gasserian) 

 ganglion 



Opthalmic division 



v lint, carotid art's plex. 



Radix longus 



Sup. cervical 

 ganglion 



Fig. 324. Schematic representation of" the innervation of the eye. Postganglionic fibers 



are shown as broken lines. 



