270 PRACTICAL HISTOLOGY fXXXIII 



On the dorsal surface of the thalamus near the mid-line a small 

 mass consisting medially of nerve-cells, the habenular ganglion, and 

 laterally of nerve fibres, the stria pinealis. Meynert's bundle will be 

 seen a little ventrally of it. 



Dorsally of the thalamus, a fold of the brain cortex, the 

 hippocampal convolution, and on the lateral edge of this a band 

 of fibres, the fimbria (continued anteriorly into the anterior 

 pillars of the fornix). 



15. Section through the anterior part of the optic 

 thalamus. 



The habenular ganglion and corpus subthalamicum are not 

 present. The lenticular nucleus and its ansa are larger. 



The nucleus caudatus is obvious. The anterior and 

 lateral nuclei of the thalamus are fairly distinct from 

 one another. Note the fornix attached to the under 

 surface of the corpus callosum. 



16. Section a little in front of the anterior com- 

 missure and optic chiasma. Note the large nucleus 

 caudatus projecting into the anterior cornu of the 

 lateral ventricle; the anterior commissure a little 

 ventrally of the inner capsule; the small lenticular 

 nucleus; the transversely cut olfactory fibres on the 

 ventral surface of the cortex. 



DEMONSTRATIONS. 



1. Frontal section through the posterior part of 

 the posterior corpus quadrigeminum with medullated 

 fibres stained. Note the radiating bundles of fibres 

 from the lateral fillet spreading out in the p. c. q. 



