THE NERVOUS SYSTEM 255 



3. How many sense organs are visible in the mesentery of your specimen? 



4. Through which nerve roots would the stimuli received by the cutaneous 

 sense organs pass into the cord? 



5. Describe the nerves transmitting the stimuli from the olfactory organ. 



6. Describe the gland secreting the tears and how they reach the nasal 

 cavity. 



7. By cutting away the lateral and dorsal walls of the orbit dissect the mus- 

 cles of the eyeball and make a drawing of them, labelling all parts. 



8. What nerves control the movements of the eyeball? 



9. Procure the eyes of any mammal from the butcher-shop or slaughter- 

 house; bisect one in the meridional and the other in the equatorial direction. 

 Make a drawing of the features seen and label. 



ID. Remove the crj-stalline lens from a fresh eye, describe its size, shape, 

 structure, length of focus, and power of magnification. 



11. Describe the path of a stimulus from the retina to the area of sight in 

 the brain. 



12. Name every feature visible in the eyes you have dissected. 



13. What ner\'e supplies the auditory organ? 



14. Describe the middle ear. 



15. In what part of the temporal bone is the internal ear located? 



16. By looking into the auditorius meatus of the dried skull two openings 

 are seen. Into which portions of the internal ear do these lead? 



17. Write a description of the internal ear. 



18. Mention some important points of difference in the nerv'ous system of 

 various mammals. 



19. What relation, if any, between intellectual ability and brain development? 



