640 



TEXT-BOOK OF PHYSIOLOGY 



are on the same level and parallel. The image of the paralyzed eye lies 

 external to that of the normal eye. 



Function. The function of this nerve is to transmit nerve impulses 

 from its cells of origin to the external rectus muscle of the same side 



FIG. 266. DIAGRAM SHOWING THE OCULAR NUCLEI AND THEIR RELATED OCULAR MUSCLES 

 ON THE SAME AND OPPOSITE SIDES: i. The sphincter pupillae nucleus; 2. The ciliary muscle 

 nucleus; 3,3'. The internal rectus nucleus and muscle; 4,4'. The superior rectus nucleus and 

 muscle; 5,5'. The inferior rectus nucleus and muscle; 6,6'- The inferior oblique nucleus and 

 muscle; 7,7'. The superior oblique nucleus and muscle; 8,8'. The external rectus nucleus and 

 muscle and its associated internal rectus muscle of the opposite side. 



and the internal rectus muscle of the opposite side and thus excite them 

 to simultaneous and consensual activity, when the eyeballs are to be 

 directed either to the right or left side. 



