422 QUESTIONS ON 



751. How is every organ connected with the brain? 



752. What two kinds of nerves, and what their offices ? 



753. How is it shown that they perform separate offices ? 



754. How do these two kinds of nerves differ in their termination? 



CHAPTER II. 



755. What three things are necessary for sensation ? 



756. What happens when the foot is asleep ? 



757. How do the nerves pass from the brain to the trunk and ex- 

 tremities ? 



758. How do injuries to the spine affect the nerves? 759, 760, 761. 

 Give illustrations. 



762. What does the case of Mr. J. illustrate? 



CHAPTER III. 



763. Why does the brain refer sensations to the end of the nerves ? 



764. If the trunk of the nerve is irritated or injured, to what part is 

 the impression referred ? 



765. Where is the seat of disease in the tic douloureux ? 766. Il- 

 lustrate by Miss W.'s case. 



767. Where do the nerves of special sense receive impressions'? 

 How can an impression like that of light be made on the brain, when 

 the eye is closed ? 



768. What illustrations are derived from the sense of hearing, and 

 of taste? 



769. What is the effect of exciting a nerve in any part of its course ? 



770. Illustrate. 



CHAPTER IV. 



771. What fact does the last section explain? 



772. How is muscular motion excited naturally? How artificially? 

 Illustrate. 



773. Where is sensation ? What is its immediate cause ? Where 

 is a true sensation excited? Where a false one ? How do the cham- 

 ber bells in a hotel illustrate true and false sensations? 



774. What instances of false sensations are mentioned? 



775. Is the communication through the nerves rapid? 



776. What organs are voluntary ? Why so called ? What are in 

 voluntary? Are these supplied with nerves? 



777. Do the voluntary organs ever act involuntarily ? State cases. 



778. What voluntary motions become apparently involuntary? 



779. Why do familiar motions exhaust less than others ? Illustrate. 



780. On what does the power of every organ to act depend ? 



CHAPTER V. 



781. Why is the brain carefully guarded from injury? 



782. The brain is the seat of what? 



783. Is the brain sensitive? Illustrate. 



784. What is the effect of pressure on the brain? 



