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 



Corpus Callosian 



^Foramen of Monro 



\ Third Ventricle 



fornix \ 



Pineal Body < 



Cerebrum 



Optic Chiasma 



IHtuitary Body / / 



Oculomotor Nerve / 

 Pons Vo-rohi / 



Aqueduct / 

 Medulla Oblongata / 

 Fourth Ventricle 



"^"-Corpora 

 Quadrigemina, 



Cerebellum 



■Spinal Cord 



Fig. 49. — Section of Brain. 



a portion actually outside the brain, but often called the 

 ^' fifth ^^ ventricle. Below this is the forniXj which forms the 

 roof of a true brain cavity — the third ventricle — ^whose 

 sides are the optic thalami. This ventricle projects forward 

 into a fimnel called the infundihulum. In the center of this 

 ventricle is a roimd 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 



