THE MID-BRAIN 



separated from the corresponding part by the notch above 

 mentioned (Fig. 10). A small oval elevation, termed the 



Cerebral aqueduct (of Sylvius) 



Oculo-motor nucleus /_ _ 

 Medial fillet 



Motor fibres' 



Oculo-motor nerve 



FIG. 10. Transverse Section through the Mid-Brain, showing the dorsal 

 portion, or tegmentum, which is separated from the ventral portion, 

 or basis pedunculi, by the substantia nigra. 



Optic tract 



Lateral geniculate bod} ~^3Bm 



Medial geniculate bod) 



Pulvinar 



Corpora quadrigemina '*' 



Mid-brain 



-Corpus mamillare 



_ Trigeminal nerve 



Pons 



Facial nerve 



FIG. ii. The Lateral Aspect of the Brain-Stem. 



medial geniculate body, is placed on the lateral aspect of the 

 cerebral peduncle and is partially overhung by the projecting 

 posterior end of the thalamus (Fig. n). It is connected 



