LECTURE IV. 



115 



In hydrocephalous cMldreu, the fluid is chiefly accumulated 

 in these cavities, which thus become enormously expanded ; in 

 the normal state, these cavities are merely fissures whose lips 

 nearly touch. On removing the hemispheres by horizontal sec- 

 tions, or on making a perpendicular section parallel with the 

 central line, we soon reach the largest system of cerebral cavi- 

 ties, the so-called lateral ventricles, which are separated in the 

 centre by a thin double septum, but are very symmetrically 

 formed. In each of these singularly curved cavities there are 

 distinguished three so-called horns ; an anterior or frontal 

 horn, which extends into the frontal lobe and overlies the cor- 

 pus striatum ; a lateral horn, which curves downwards into the 

 temporal lobe, and exhibits in its interior a club-shaped emi- 



ca. 



Fig. 36. Human brain viewed from above. The right hemisphere re- 

 moved down to the lateral ventricles. The description of the left side is the 

 same as in the preceding figures. On the right side, c s indicates corpus 

 striatum, forming the floor in the anterior comer of the ventricle, c a, Cornw 

 ammonis, curving into the lateral corner of the ventricle, h m, Hippocampus 

 m.inor, forming the floor of the posterior cornu. 



i2 



