478 



PHYSIOLOGY 



distributed chiefly to the parietal lobe. The occipital fibres issue from 

 the outer part of the pulvinar and constitute the so-called ' optic 

 radiation/ passing outwards and backwards to be distributed to the 

 cortex of the occipital lobe. The ventral fibres pass downwards and 

 outwards below the lenticular nucleus and end partly in the latter 

 nucleus and partly in the cortex of the temporal lobe and of the insula 

 or island of Reil. 



CORP. CALLOSUM 



.-ANT 1 ? LIMB 

 INT 1 : CAPSULE 



TEMPORO-PONTINE 

 TRACT 



LOBE 



FIG. 213. Schema of projection fibres of cortex. (CUNNINGHAM.) 



(2) THE FILLET SYSTEM OF FIBRES. This great mass of ascending- 

 fibres has been already described (cp. Fig. 198) as gathering up the 

 impulses from the different sensory nerves of the cerebro- spinal system 

 and terminating in the thalamus and subthalamic region. According to 

 some observers a certain number of its fibres pass through the thalamus 

 to reach the cortex without interruption, but this is probably incorrect. 



(3) THE SUPERIOR CEREBELLAR PEDUNCLE. These fibres, from 

 the central ganglia of the cerebellum, terminate for the most part in 

 the thalamus and subthalamic region. It is possible that some of 

 them may pass through the hinder end of the internal capsule, without 

 interruption in the thalamus, to end in the Rolandic area. 



