100 



EXPERIMENTAL PHYSIOLOGY 



white, fibrous body (corpus callosum) which unites the two 

 hemispheres. In the front part of this are seen the thin 

 membranes (septum lucidum) which inclose between them 



JForamen of Monro 



Optic Chiasma 



Pituitary Body 



Oculomotor Nerve 



Fons Varolii 



Medulla Oblongata / 

 Fourth Ventricle 



Spinal cord 



FIG. 49. Section of Brain. 



a portion actually outside the brain, but often called the 

 " fifth" ventricle. Below this is the fornix, which forms the 

 roof of a true brain cavity the third ventricle whose 

 sides are the optic thalami. This ventricle projects forward 

 into a funnel called the infundibulum. In the center of this 

 ventricle is a round body (the median commissure) which 

 was cut through by the section. In front of this is a 

 small aperture (the foramen of Monro) that connects this cav- 

 ity with a cavity in the right hemisphere. The floor of the 



