THE CEREBRUM 



Fissura Chorioidea, The chorioidal fissure forms the an- 

 terior portion of the medial or upper boundary of the posterior 

 part of the inferior surface of the hemisphere. In the region of 

 the fissure the wall of the cavity of the hemisphere is reduced 

 to a thin layer of epithelium, and the fissure is produced by 

 the invagination of the epithelial wall, into the inferior cornu 

 of the lateral ventricle of the hemisphere, by a vascular fold 

 of pia mater. 

 r*y vX fl / k < *'* Su i 



Sulcus cinjjuli 



'ek Chorioidea of the third ventricle in chorioidal fissure 



Central sulcus ( 



ippocampal rudiment (medial and lateral striae) * 



L. \*'" ^ 



Splenium of corpus callosum ^K^L \ 



'arieto-occipital fissure 

 Calcarine fisst 



\ 



Massa intermedia 

 i Fornix 



| Interventricular foramen 

 i ' Anterior commissure 



* Septum pellucidum 

 ,' * Paraterminal body 

 ! " ';' i ^ ' , Subcallosal gyrus 



i- / / ( ",enu of corpus callosui 



]- .'! ! ' I ^~L Hippocampalrudime 

 ' y. " / Gyrus cinguli 



K 



Stem of cal- 

 :ariue fissure 



Isthr 

 Hippocampus-' ' 



Fasciola cinerea / ' / I 



Thalamus (cut)' / / / 

 -' / / 



Pia mater in chorioidai fissure _J I I 

 Fascia dentata / / 

 Collateral fissure / 

 Paradentate acea 



\ Olfactory bulb 



Olfactory tract 

 Lamina terminalis (cut) 

 Medial stria of olfactory tract 

 \ Lateral 5triajoJ^glf_actory tract 

 J 1 \ Rhinaljssure 



I \ PirLform area 

 | Cauda fasciae dentatce 

 Hippocampus 



Pedunculus cerebri (cut) 



f'dt. 



FIG. 156. Diagram showing portions of the Hippocampus and associated 

 parts. The green line represents the indusium, which is a rudiment of 

 the hippocampal formation. 



Below the posterior part of the chorioidal fissure the stem 

 of the calcarine fissure reaches the inferior surface, after cutting 

 across the medial occipital border of the hemisphere. 



Fissura Collateralis. The collateral fissure is placed more 

 laterally and on a lower level than the chorioidal fissure. It 

 lies below the stem of the calcarine fissure and extends 

 forwards beyond its anterior extremity (Figs. 156, 159). 



The Rhinal Fissure lies anterior to and slightly above or 

 medial to the anterior end of the collateral fissure. 



