THE CEREBRAL CORTEX 611 



type. Next the surface of the cortex the neuroglia tissue is condensed, 

 forming a thick peripheral velum. 



The foregoing is summarized in the following outline: 



fHemispheres 



{Lobes [Vermis 



Lobules 

 Folia 

 I. Cortex. 



A. Molecular layer. 



1. small cortical cells. 



2. basket cells small stellate cells large cortical cells. 



3. Purkinje cells. 



B. Nuclear or Granular layer. 



1. granule cells, with dendritic arborizations ending in 



close association with eosin bodies. 



2. large stellate cells. 



3. solitary cells. 



II. Medulla medullated nerve fibers. 



(a) axon of Purkinje cells. 



(b) mossy fibers, ending in eosin bodies of granular 



layer. 



(c) climbing fibers. 



THE CEREBRAL CORTEX 



The cerebrum consists of two large symmetrically paired lobes or 

 hemispheres connected, by a bridge of white matter, the corpus callosum. 

 Each hemisphere includes essentially a central mass of white substance 

 or medulla,, containing the internal nuclei or basal ganglia paired 

 masses of gray matter and a covering of gray substance, the cortex or 

 pallium. The cortex is greatly folded, thus becoming marked by con- 

 volutions or gyri with intervening fissures or sulci. The surface of each 

 hemisphere may be divided into four principal lobes: (1) the frontal 

 lobe, bounded posteriorly by the fissures of Eolando and Sylvius; (2) 

 the parietal lobe, extending from the fissure of Eolando in front to the 

 parieto-occipital fissure behind and the Sylvian fissure below; (3) the 

 occipital lobe, bounded anteriorly by the parieto-occipital sulcus; and 



