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INTRODUCTION TO NEUROLOGY 



wholly to various types of correlation. It has three main divi- 

 sions, the thalamus, the epithalamus, and the hypothalamus, of 

 which the two last are dominated by the olfactory apparatus 

 (see p. 220). 



The epithalamus consists of the membranous chorioid plexus 

 which forms the roof of the third ventricle (Fig. 79), the pineal 

 body or epiphysis (Fig. 76), the habenula (marked trigonum 



Genu of corpus callosum 

 Corpus callosum (cut) 



Cavum septi pellucidi 

 Septum pellucidum 



Caudate nucleus 



Fornix 



Foramen interventriculare 

 Anterior commissure 

 Ant. tubercle of thalamus 

 Massa intermedia 



Third ventricle 

 Stria terminals 

 Ta'nia thalami 

 Trigonum habenulse 



Posterior commissure 

 talk of pineal body 

 Pulvinar 

 Pineal body 



Non-ventricular part of 

 thalamus 



Groove correspondin 



to fornix 

 Quadrigeminal bodi 



Trochlear nerv 

 Brachium ponti 

 Brachium conjunctivum 

 Lingula 



Medulla oblongata 



Fig. 76. A dissection of the brain from above to expose the thalamus and 

 corpus striatum. (From Cunningham's Anatomy). 



habenulae on Fig. 76), and the stria medullaris, a fiber tract which 

 connects the olfactory centers of the cerebral hemispheres with 

 the habenula (Figs. 78, 79). The habenula is a center for the cor- 

 relation of olfactory sensory impulses with the various somatic 

 sensory centers of the dorsal part of the thalamus. The pineal 

 body of some lower vertebrates is a sense organ, apparently 

 visual in function and known as the parietal eye (p. 212); in 



