XXXIII] THE MID-BRAIN AND INTER-BRAIN 271 



2. Frontal section through the anterior corpus 

 quadrigeminum with medullated fibres stained. Note 

 the fibres spreading outwards from the middle and the 

 deep white layer (optic tract fibres, fibres to cerebrum 

 and fibres from fillet), and the thin layer of superficial 

 fibres (optic tract fibres). 



