8o 



ESSENTIALS OF PHYSIOLOGY. 



known as the corpus striatum, lies in the interior of each hemisphere, 

 lateral to the thalamus and separated from it by a sheet of white 

 matter, the internal capsule. Each hemisphere also contains in its 

 interior a lateral ventricle, which is in communication with the third 

 ventricle. 



1. Outer fibre lamina. 



2. Outer cell lamina. 



3. Middle cell lamina. 



4. Inner fibre lamina. 



5. Inner cell lamina. 



FIG. 24. Structure of cortex of motor leg area. 

 (Starling's Principles of Physiology. ) 



The grey matter consists of nerve cells and nerve fibres, arranged 

 in layers. The axons of the nerve cells become either projection 

 fibres or association fibres. Other fibres terminate by arborisation in 

 the grey matter ; so^le of these are projection fibres, most of which 

 are axons of cells in the thalamus, and others are association fibres, 

 proceeding from cells in other parts of the cortical layer. 



The structure of the grey matter varies in different regions of 



