100 



Cerebrum. 



440. Horizontal Section of the Cerebrum, 



on a level with the Corpus callosum. 2 / ;j natural si/e. 



The examination of the cerebrum is made in the following manner: 

 The skull-cap is removed after a circular incision has been made 

 with the saw, between the superciliary ridges and frontal eminences 

 and above the external occipital protuberance. The Dura mater is cut 

 open lengthwise on both sides of the longitudinal sinuses, and from the 

 middle of these sections, a transverse cut is made ; it is then folded 

 back. The Falx cerelri is to be separated at the Crista galll and laid 

 back, and the veins opening into the longitudinal sinus must be divided. 

 In this manner both hemispheres of the cerebrum and the great longi- 

 tudinal fissure are brought into view. - The two hemispheres can be 

 removed by horizontal sections down to the upper surface of the Corpus 

 call o sum. 



