CH. XLV11I.] 



THE PROJECTION FIBRES 



699 



Fid. 436. Lateral view of a human hemisphere, showing the main bundles of association fibres (Starr). 

 A, A, between adjacent convolutions ; B, between frontal and occipital areas ; C, between frontal 

 and temporal areas (cingulum) ; D, between frontal and temporal areas (fasciculus uncinatus) ; E, 

 between occipital and temporal areas (fasciculus longitudinalis inferior) ; C.N., caudate nucleus; 

 O.T., optic thalamua. 



Fio. 437. Schema of the projection fibres within the brain (Starr). A, tract from the frontal gyri to the 

 pons nuclei and so to the cerebellum ; B, motor pyramidal tract ; C, sensory tract for touch ; 

 D, visual tract; E, auditory tract; F, G, H, superior, middle, and inferior cerebellar peduncles; J, 

 fibres between the auditory nucleus and the inferior corpus quadrigeminum ; K, motor decussation 

 in the bulb ; F.V., fourth ventricle. The numerals refer to the cranial nerves. The sensory radia- 

 tions are seen to be massed towards the occipital end of the hemisphere. 



