PROJECTION OF THE RETINA IN THE BRAIN 9 



Thus far this locahzation was not an absolute one, but a 

 very distinct localization of the different parts of the retina 

 in the primary optic centres was found. The cells of the 

 upper quadrants of the retina send their fibres to the ventral 

 part of the external geniculate body, while those of the lower 

 quadrants terminate dorsally. Further, the nasal part of 

 the retina is always projected laterally to the temporal half. 



CROSSED 



ORAAL 



UNCROSSED 



CAUDAAL 



ORAAL 



CAUDAAL 



i=Temporal Lower lv1j= Nasal Lower 



=Temporal Upper 



= Nasal UPPER 



FiG.'l. Projection of the Various Quadrants of the Retina on the 

 Crossed and Uncrossed External Geniculate Body in Rabbits 



(After Overbosch) 



The uncrossed tract in rabbits is very small as I have 

 already mentioned, because the eyes are situated so far 

 sidewise in the head. These uncrossed fibres terminate in a 

 pretty large, but circumscribed portion in the medial part 

 of the geniculate body. They there mix with fibres of the 

 crossed retina. Again the lower half lies above the upper 

 half of the retina. In .this medial portion of the external 

 geniculate body the part of the retina by which the animal 



