THE CEREBRUM 



of the brain. Each thalamus presents an anterior and a 

 posterior^ extremity, and four surfaces. The inferior and 

 lateral surfaces are in apposition and, indeed, directly con- 

 nected with adjacent parts. The superior and medial surfaces 

 are free. 



The lateral surface of the thalamus is applied to a mass 



Cut surface of genii 

 of corpus callosum 



Genu of corpus callosum 



Cavum septi pellucidi- 



Fornix- - ? 



Anterior commissure ,: 



Massa intermedia 



Groove on thalamus - 



f6r fornix 



Posterior commissure ,-"' 

 Trochlear nerve '* 

 Brachium pontis ' 

 Corpora quadrigemina 



Brachium conjunctivum ' 



Septum pellucidum 

 Caudate nucleus 



Right column of fornix 



Anterior tubercle of 

 r thalamus 



'*~\- - Vena terminalis 

 " Ventricle in. 

 ] ' Tsnia thalami 



~~ Trigonum habenula? 

 x -Pulvinar 



'Stalk of pineal body 

 'Pineal body 



Lingula of cerebellum 

 Medulla oblongata 



FIG. 206. The two Thalami and the Third Ventricle 

 as seen from above. 



of white matter, termed the internal capsule, which is composed 

 largely of fibres from the basis pedunculi. The inferior or 

 ventral surface of the thalamus rests chiefly upon the sub- 

 thalamic region, which is the prolongation upwards of the 

 tegmental part of the pedunculus cerebri. The relation, 

 therefore, which the thalamus presents to the upward continua- 

 tion of the pedunculus cerebri is very intimate. 



The superior surface of the thalamus is free. On the 

 lateral side it is bounded by the groove which inter- 



ii 32 & 



