204 ELEMENTS OF MAMMALIAN ANATOMY. 



The association fibers are those which connect different 

 portions of the same cerebral hemisphere. Two kinds are 

 recognized. The short fibers connect adjacent convolu- 

 tions, while the long ones place in communication two re- 

 mote portions of a hemisphere. 



PRACTICAL QUESTIONS AND SUGGESTIONS. 



1. Describe the membranes of the cord. 



2. What difference in the size of the nerve roots in the various 

 regions of the cord? 



3. Draw a cross-section of the cord showing all features visible to 

 the naked eye. 



4. How does the arrangement of the gray matter of the cord and 

 brain differ? 



5. Describe the processes of nerve cells. 



6. In what portions of the body are nerve cells found? 



7. What is the location of the cells whose protoplasmic processes 

 largely make up the fasciculi cuneatus and gracilis. 



8. What part of the cord is occupied by the chief motor tract? 



9. What tracts of the cord originate or terminate within the cere- 

 bellum? 



10. Describe the course of the crossed pyramidal tract throughout 

 the axial nervous system. 



11. Describe three bundles of commissural fibers in the brain. 



12. Which tract of the projection fibers contains the longest axones? 



13. Describe the great sensory tract of the brain. 



14. What do the association fibers connect? 



15. Tell what is known of the functions of various regions of the 

 cortex. 



16. Explain why paralysis of the left side of the body would result 

 from an injury to the right motor region of the cortex. 



17. Procure a piece of spinal cord from the butcher-shop. Smear 

 a bit of the gray matter on a glass slip, dry, then stain in hematoxylin, 

 wash, and after drying mount in balsam. Draw and describe nerve 

 cells thus found. 



THE PERIPHERAL NERVES. 



All portions of the head, trunk, and limbs of the cat are 

 supplied with nerve fibers which are in communication with 

 the central nervous system by means of fifty-two pairs of 



