MORPHOLOGY OF THE FOREBRAIN 495 



Tela chorioidea telencephali 



Paraphysis 



Chiasma opticum 



Commissura postoptica (com. superior Meynerti and 



com. inferior Guddeni BNA) 

 Commissura anterior 

 Nucleus preopticus 

 Hemisphaerium 



Ventriculus lateralis 

 Pars ventralis 



Pars ventro-medialis (characterized by the tractus 

 ventro-medialis hemisphaerii — "olfactory radia- 

 tions," etc.) 



Corpus precommissurale 

 Tuberculum olfactorium 

 Pars ventro-lateralis (characterized by the tractus 

 ventro-lateralis — " internal capsule" system) 

 Corpus striatum 

 Pars dorsalis s. pallialis 

 Plexus lateralis 

 Hippocampus (cortex medialis) 



Commissura hippocampi 

 Lobus pyriformis (cortex lateralis) 

 Neopallium (cortex intermedius) 

 Corpus callosum 

 Bulbus olfactorius 

 In classifying the lobus pyriformis (gyrus hippocampi and 

 uncus, BNA) as a part of the pallium in the above table there is 

 a certain inconsistency; but the irregularity is inherent in the 

 anatomical facts and will have to be recognized in some other 

 way, if not in this way. Phylogenetically both the hippocampus 

 and the lobus pyriformis take their origin from the primitive area 

 olfactoria. The hippocampus has differentiated far from this 

 original type and sucn olfactory fibers as enter it are for the most 

 part interrupted by a synapse in the corpus precommissurale. 

 The lobus pyriformis, on the other hand, remains much more 



