388 THE NERVE SYSTEM 



13. What is the function of the axones as regards nerve impulses? 



14. What do nerve fibres consist of? Name the two varieties. 



15. Name the portions of a mcdullated nerve fiber. 



16. Differentiate a medullated from a non-medullated nerve 

 fiber. 



17. What do you understand by a node of Ranvier? 



18. What is the difference in color between nerve tissue formed 

 of medullated and non-medullated nerve fibers? 



19. What forms a nerve? What are the functions of the epi- 

 neurium, perineurium, endoneurium? 



20. Name the two kinds of nerve tissue which support the nerve 

 cells. Are they active as regards the conveyance of nerve impulses? 



21. What do you understand by the superficial and deep origin 

 of a nerve? 



22. How does an efferent nerve end? 



23. How does an afferent nerve end? 



24. Name some of the end-organs. 



25. Does an efferent nerve convey impulses from the brain and 

 spinal cord to the tissues? 



26. In which direction does an afferent nerve convey impulses? 



27. How does an efferent nerve end in a skeletal muscle? 



28. Describe a nerve plexus. 



29. Do the nerve fibers in a plexus maintain the same function 

 as the nerve possesses from its origin? 



30. Where are ganglia found? Do their neurones connect with 

 the brain and spinal cord? 



31. What is the function of a ganglia as regards the conveyance 

 of nerve impulses? 



32. Name the two classifications of nerves concerned in all nerve 

 action or reflex. 



33. Describe the physiology of a nerve. 



34. What do you understand by the term nerve irritability? 

 Excitability? 



35. What is essential to develop or convey nerve impulses in a 

 nerve? 



36. Name some special stimuli which develop impulses in the 

 endings of afferent neurones and are conveyed to the brain and 

 spinal cord. 



37. How do stimuli arise which develop impulses in the neurones 

 of efferent nerves and are conveyed to muscles, organs, etc.? 



38. Name the parts of the nerve system included under the 

 central nerve system. 



39. Where is the spinal cord located in the body? How long is it? 

 What is its weight? 



40. Name the membranes surrounding the spinal cord. 



41. Name the chief columns of the spinal cord. What composes 

 them? Give their general function. 



42. Give a brief description of a cross-section of the spinal cord. 



43. What is the function of the efferent motor nerve cells in the 

 spinal cord? Afferent sensor nerve cells? Intrinsic nerve cells? 



44. How many pairs of spinal nerves are there? Give the number 

 as to the portion of the cord from which they arise. 



