GENERAL PHYSIOLOGY OF THE CEREBRUM. 



185 



Fig. 82. Schema of the projection fibers of the cerebrum and of the peduncles of the 

 cerebellum; lateral view of the internal capsule : A, Tract from the frontal gyri to the pons 

 nuclei, and so to the cerebellum (frontal cerebro-cortico-pontal tract) ; B, the motor 

 (pyramidal) tract ; C, the sensory (lemniscus) tract ; D, the visual tract ; E, the auditory 

 tract ; F, the fibers of the superior peduncle of the cerebellum ; G, fibers of the middle pedun- 

 cle uniting with A in the pons ; H, fibers of the inferior peduncle of the cerebellum ; J, fibers 

 between the auditory nucleus and the inferior colliculus ; K, motor (pyramidal) decussation 

 in the bulb ; Vt, fourth ventricle. The numerals refer to the cranial nerves. (Modified 

 from Starr.) 



Fig. 83. Lateral view of a human hemisphere, showing the bundles of association 

 fibers (Starr) : A, A, Between adjacent gyri; 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 longitudinalia 

 inferior ; C.N, caudate nucleus ; O.T, thalamus. 



tern may be defined as comprising those fibers which connect one 

 part of the cortex with another (Fig. 83). There are short associ- 



