ANATOMY IN A NUTSHELL. 



349 



consists of a body and two anterior pillars and two posterior pillars . It is sit- 

 uated just beneath the corpus callosum. its posterior part being attached to the 

 corpus callosum. The body is triangular with the apex in front and base be- 

 hind. It forms one of the boundaries of the roof of the third ventricle and part 

 of the floor of the lateral ventricle. The anterior pillars or columx.e for- 

 NICES, descend from the gray matter of the third ventricle behind the anterior 

 commissure and in front of the foramen of Monro. As they descend they 

 spread out. leaving an interval which is occupied by the septum lucidum. 

 They receive reinforcements from the tsenia semicircularis and the crura of 

 the pineal gland and the septum lucidum. They form loops around the cor- 



PLATE CLXIX. 



GREAT LONGITUDINAL FISSURE 



j&M 



OLFACTORY TRACT 



A Coronal Section Through the Anterior Horns of the Lateral 



Ventricles. 



jiora albicantia, making the stroma zonale or white portion.- of these bodies. 

 Fibres continue from the corpora albicantia and the optic thalamus called 

 filn rs of Vizq'd'azyr. The posterior pill uts of the fornix descend from the sides 

 of the body of the fornix and between the diverging crura and the splenium of the 



corpus callosum is the psalterium or lyra consisting of white matter and having 



on its surface some transverse oblique, and longitudinal line-. From it- fancied 

 '' semblance to the strings of a harp this area is called a lyra. Bach pillar 

 passes around the pulvinar of the optic thalamus and then descends in the 

 descending horn of the lateral ventricle. While there they send libers t<> the 

 hippocampus major ami end in the gyrus hippocampus and the uncinate gyrus. 

 The corpus callosum (callous body) is the great white commissure of the 



