2l6 ELEMENTS OF MAMMALIAN ANATOMY. 



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 tracts of Goll and Burdach? 



8. W T hat 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. 



1 1 . Describe three bundles of commissural fibers in the brain. 



12. Which tract of the projection fibers contains the longest axis- 

 cylinder processes? 



1 3 . 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 nerve bundles, forming what are known in the 

 brain region as the cranial nerves and in the region of 

 the cord as the spinal nerves. 



The Cranial Nerves.- -There are twelve pairs of cranial 

 nerves, all of which pass through foramina in the base 

 of the skull, and all except one, the tenth or vagus, are 



