PHYSIOLOGY 



from its fellow to pass up into the cerebral hemispheres. Into this layer, 

 ' the internal capsule/ fibres proceed from all parts of the thalamus to pass 

 to the cerebral cortex. The anterior extremity of the thalamus, known as the 

 anterior tubercle, forms a marked projection into the lateral ventricle. In 



Corpus callosum 

 Lateral ventricle 

 Nucleus caudatus 



Internal capsule 



Thalamus 

 Nucleus lentiformis 



Anterior commissre 



Collie ulus superi 

 Inferior brachium 



Colliculus inferior ^^ 



4th nerve 



Trigonum lemnisci 

 5th nerve 



Brachium conjunct! vum 



8th nerve 



Uestiform body 



9th nerve 



10th nerve 



Olive 



Optic nerve 

 Ant. perforated space 



Optic tract 

 3rd nerve 

 Corpus mammillare 



7th nerve 



JjfKI9B v 12th nerve 



FIG. 189. Right lateral aspect of brain stem, with a part of the cerebrum. 

 (J. SYMINGTON.) 



front of this, the foramen of Monro leads from the third ventricle into the 

 lateral ventricle. This foramen is bounded anteriorly by a strand of fibres, 

 known as the ' anterior pillar of the fornix,' which lies just behind the anterior 

 commissure and forms a conspicuous feature in the anterior part of the 

 lateral wall of the third ventricle. It passes in the wall down to the corpus 

 mammillare. From the corpus mammillare a well-marked bundle of fibres 

 passes up into the optic thalamus to end round the large cells in the anterior 

 nucleus of the thalamus. The posterior extremity of the thalamus 

 forms a definite prominence, the pulvinar. To the outer and back 

 part of the pulvinar two bodies are developed, known as the geniculate 



