FUNCTIONAL PARTS OF THE NERVOUS SYSTEM 



67 



corpus callosum the gray matter lies wholly in the cortex, but below that 

 level the gray matter constitutes the corpora striata, the optic thalami, 

 the lenticular nuclei, etc., as well as the cortex. The functions of these 



FIG. 37 



Left hemisphere, dorsolateral surface. (Eberstaller.) 



various nuclear regions will be considered later. The white matter of the 

 cerebrum seems to be made up of fibers which conduct impulses from one 

 part of the brain to another, and especially from the cortex on all sides, 

 inward and downward, and which constitute more or less directly the 



FIG. 38 



Right hemisphere, mesial surface. (Eberstaller.) 



spinal cord and the cranial nerves passing outward within the skull. 

 Above, these fibers, converging toward the pons, start from the cortex 

 as the corona radiata, and farther down they are called, misleadingly, 



