THE CEREBRUM 



423 



calcarine fissure and its boundaries, and the relationships of 

 the occipital and temporal lobes on the inferior surface, can 

 be made at a later stage of the dissection. 



Caudate nucleus in lateral ventricle 

 Remnant of septum pellucidu 

 Genu of corpus callosum 

 Superior frontal gyrus j 

 Callosal sulcu 

 Sulcus cinguli 



Massa intermedia 



Fornix 

 Gyrus cinguli 



Inferior surface of fornix 



Superior surface of thalamus 

 | , Upper end of central sulcus 



Splenium of corpus callosum 

 i Paracentral lobule 



Median part of transverse fissure 

 Pineal body 



Lamina quadrigemina 

 urn) 



Subparietal sulcus 

 Icarine fissure 



Parieto-occipital 

 "ssure 



Gyrus rectus -.!* 

 Rostrum of corpus callosum 

 Anterior commissure 

 Lamina terminalis 

 Supra-optic recess 



Optic chiasma ./ j 

 Arrow passing through inter- / 

 ventricular foramen " J 

 Infundibulum 

 Mamillary body 

 Oculo-motor nerve 



Pedunculus cerebri / 

 j 



Poos 



Medulla oblongat 



Groove for 

 superior sagilt 

 sinus 



Lingual gyrus 

 Cerebellum 



\ Fourth ventricle 

 Median aperture of fourth ventricle 

 Central canal of spinal medulla 



Medulla spinalis 



FIG. 160. Medial surface of the Right Hemisphere, and the structures seen 

 after a sagittal section has been made through the Corpus Callosum, 

 the Fornix, the Diencephalon, the Mesencephalon, and the Rhomb- 

 encephalon, and after the Septum Pellucidum has been removed from 

 between the Corpus Callosum and the Fornix. The arrow passes 

 through the interventricular foramen from the right lateral ventricle to 

 the third ventricle, where it lies in the hypothalamic sulcus in the lateral 

 wall of the third ventricle. 



When the upper parts of both hemispheres have been 

 removed the upper surface of the corpus callosum will be 

 exposed ; and it will be evident that the corpus callosum 

 unites into one mass the medullary centres of the two 

 hemispheres. The term centrum ovale is applied to the 



in 27 b 



