VISUAL REFLEXES 409 



columns. Receiving fibres above through the anterior commissure from 

 the optic ' thalamus, and from the superior corpora quadrigemina, it is 

 associated in its course with the three motor nuclei that give origin to the 

 nerves supplying the muscles of the eyeball, viz. the third, fourth, and sixth 

 nerves. Fibres enter the posterior longitudinal bundle from the auditory 

 system, and from the superior olive, and connections are also established 

 between this bundle and the facial nucleus, and the nucleus of Deiters, 

 representing the central station of impulses from the labyrinth. The general 

 connections of the bundle are shown in Fig. 205. 



