BASAL GANGLIA 



465 



Note further, that the plane of the section under con- 

 sideration is anterior to the anterior end of the inferior cornu 

 of the lateral ventricle (see Fig. 187). (4) That in the fourth 

 section (a) The fibres of the internal capsule are directly 

 continuous, below, with the fibres of the basal or anterior 

 part of the peduncle of the cerebrum, and, above, with the 

 corona radiata, to which fibres converge from the adjacent 

 parts of the grey matter of the cortex, (b) In the region 



Longitudinal fissure 



Chorioid plexus 

 Lateral ventricle 



Claustrum 



Corpus callosum 

 ,-Fornix 



Tela chorioidea of 

 'third ventricle 



-Caudate nucleus 

 -Vena terminalis 



-Thalamus 



-Ventricle in. 

 Chorioid plexus 

 'Internal capsule 



For. interventriculare 

 Column of 

 fornix 

 Optic tract 



Anterior commissure 

 Optic nerve 



Globus pallidus' 



Amygdaloid nucleus 

 Fasciculus mamillo thalamicus 



Substantia perforata anterior 



' Olfactory tract 

 i Optic chiasma 



Infundibulum 

 Column of fornix 



FIG. 187. Frontal section through the Cerebral Hemisphere in such a plane 

 as to cut the three parts of the lentiform nucleus ; the posterior cut 

 surface of the anterior part of the hemisphere is depicted. 



now under consideration, the thalamus rests upon the sub- 

 thalamic region which is directly continuous with the teg- 

 mental or dorsal part of the corresponding pedunculus 

 cerebri. (c) In the subthalamic region two additional nodules 

 of grey matter are easily recognisable. The medial and 

 more rounded of the two is the upper part of the red nucleus, 

 which extends downwards, through the upper half of the 

 tegmental portion of the mid-brain. The more lateral is the 

 VOL. in 30 



