254 



THE GROWTH OF THE BRAIN. 



crossed relations which they finally attain with the cere- 

 bral hemispheres are due to the interpolation of fibres 

 arising from the central cells. 



The study of the lower vertebrates after injury to the 



Ca. 



FlG. 52. Showing in man the connection of the primary centres 

 for vision with the occipital cortex by means of the optic 

 radiation. (Edinger.) Ca., anterior commissure ; C.g.L, lateral 

 geniculate body ; C.g.m.. mesial geniculate body ; C.g.a., an- 

 terior quadrigeminum; C.g.p., posterior quadrigeminum; //., 

 hypophysis ; L.occ., occipital lobe; P., pons ; Jr., optic tract ; 

 ///., oculo-motor nerve ; IV., trochlear nerve ; V., trigeminal 

 nerve ; VI., abducent nerve. 



different divisions of the central system shows that in 



