THE INTERNAL CONFIGURATION OF THE CEREBRAL HEMISPHERES 



247 



part is formed by the corpus callosum, and the medial wall by the septum pellu- 

 cidum. The floor, which slants to meet the roof at the lateral angle, is com- 

 posed from within outward of the following structures: the fornix, chorioid 

 plexus, lateral part of the dorsal surface of the thalamus (in man, but not 

 in the sheep), the stria terminalis, vena terminalis, and the caudate nucleus 

 (Figs. 177-180, 188). The caudate nucleus tapers rapidly as it is followed 

 from the anterior horn into the body of the ventricle (Fig. 177). The cavity 



Longitudinal fissure of cerebrum 

 Lamina of septum pellucidum / 



Column of fornix 

 Caudate nucleus 



Interventricular foramen 



Thalamus 



Body of fornix 



Chorioid plexus 



Transverse fissure of / 

 cerebrum 



Rostrum of corpus callosum 

 ' ^Corpus callosum 



/ Cavity of septum pellucidum 

 Anterior horn of lateral ventricle 

 /Caudate nucleus 



Chorioid plexus of lateral 

 ventricle 

 , Terminal stria 



Central portion of 

 lateral ventricle 



- Chcrioid glomus 



- Cms of fornix 



.-Inferior horn of 

 lateral ventricle 



Splenium of corpus callosum 



* Posterior horn of lateral ventricle 

 Calcarine fissure 

 Cerebellum 



Fig. 177, Dissection of the human telencephalon. The corpus callosum has been partly removed, 

 and the lateral ventricles have been exposed. Dorsal view. (Sobotta-McMurrich.) 



is lined throughout by an ependymal epithelium, indicated in red in Fig. 155. 

 Between the caudate nucleus and the fornix this layer of ependyma constitutes 

 the entire thickness of the wall of the hemisphere. In man, where the fornix 

 and caudate nucleus are more widely separated than in the sheep, this epithelial 

 membrane rests upon the thalamus and becomes adherent to it as the lamina 

 affixa (Figs. 154, 155). At the margin of the fornix a vascular network from the 

 tela chorioidea, i. e., from the pia mater in the transverse cerebral fissure, is 



