286 C. U. Ariens Kappers 



In anthropomorpha and especially in man, this fused middle part pre- 

 sents a medio-frontal protrusion (fig. i8) and thus acquires a position 

 between Edinger-WestphaV s cell-groups which effect lens accommodation 

 by means of post ganglionic fibres from the ciliary ganglion to the inter- 

 na! eye-muscles. 



Apart from their clinical importance Brouwer s investigations are inte- 

 resting with regard to our subject. They clearly demónstrate that sti- 

 muli, in casu those, calling forth convergency, while stimulating the nu- 



Xu. Edinger W'estph. 





'^'^^*. '• 'lll,* .*' "nSP Xu. dors. 



^Ñm 



Xu. Centr. 

 Perlia. 



Fig. 19. — Section through the frontal half of the nucleus III in man to show the 

 central position of the nucleus of Perlia on the level of the Edinger-Westphal 



nucleus. 



clei of both the recti interni (a correlata complex of reflexes), will also 

 cause a correlated arrangement of the cells of those nuclei, connected 

 with that reflex, thus forming Perlia s central nucleus which at first only 

 lies on the level of the cells of the rectus internus itself. The successive 

 frontal shifting of the fused cells, causing its position in anthropomor- 

 phae and man on the level of the nucleus of the internal eye muscles 

 (figure IQj finds its explanation in the fact that in active binocular visión, 

 (as only occurs ir higher mammals and man), convergency is always 

 accompanied with accommodation which is effected by the Edinger- 

 Westphalgroup. 



So far concerning the shiftings and different arrangements of the root- 

 cells of the eye-muscle nerves, of which other examples will soon be pu- 

 blished by Dr. Bekclsky from Brünn and which plainly demónstrate the 



J 



